AncestryDNA vs MyHeritage for French-Canadian Roots

If you have narrowed your DNA decision down to two names, you have probably landed on the right shortlist. For French-Canadian and Acadian research, AncestryDNA and MyHeritage are the two autosomal tests most worth your money—and they are different enough that the better choice genuinely depends on what you are trying to do. This is a head-to-head on the points that matter for Québec roots.

Database size: AncestryDNA wins, and it matters most

In match-based genealogy, the size of the database is the single biggest predictor of success, because the relative who holds the answer to your brick wall can only help you if they are in the same pool you are. AncestryDNA’s database is the largest in the industry by a wide margin—many times the size of MyHeritage’s—and it is especially dense with North American testers, which is precisely where most descendants of Québec families now live.

For a Franco-American family in New England or the Midwest, or a family still rooted in Québec, that density means more meaningful matches and a better chance that someone has already done—and shared—the work you are about to start. On raw numbers, this is AncestryDNA’s race to lose.

Where MyHeritage pulls ahead

MyHeritage’s user base is more international, so if the relatives you are hunting are likely to be in France or elsewhere in Europe, it can surface matches Ancestry simply does not have. Two other advantages stand out for our purposes:

• Free DNA uploads. MyHeritage lets you upload the raw data file from an AncestryDNA test at no charge and see your matches. A modest one-time fee unlocks the advanced tools. This means the smart play is often “test at Ancestry, upload to MyHeritage”—two databases for roughly the price of one.
• A chromosome browser. AncestryDNA famously omits this. MyHeritage includes it, and for an endogamous population it is a real tool: it lets you see where on the chromosomes you match someone, which is part of how you separate a genuine recent cousin from the background relatedness that endogamy sprays across everyone.

Ethnicity estimates

Neither company can tell you which parish your ancestor came from—ethnicity estimates are broad-brush and should never be mistaken for genealogy. That said, MyHeritage is generally well regarded for European breakdowns, which can be mildly useful when you are trying to confirm a French rather than, say, an Irish or German thread in a mixed family. AncestryDNA’s estimates are also solid and update periodically. Treat both as a fun headline, not evidence; the records are where the real answers live.

Tools for matches

AncestryDNA’s ThruLines and MyHeritage’s Theory of Family Relativity do the same basic job: they guess how a DNA match connects to you by reading shared trees and records. Both are genuinely helpful starting points and both are routinely fooled by French-Canadian endogamy, proposing a closer or more recent connection than the documents support. Use them to point you at a likely common ancestor, then prove or disprove that link in the parish registers.

The records connection: a quiet point in Ancestry’s favour

Because Ancestry also hosts the digitized Drouin Collection, a DNA match on Ancestry can flow straight into the actual Québec church records on the same platform. You see a promising match, you open your shared tree, and the baptism and marriage images are right there to confirm it. MyHeritage has strong records too, but the specific synergy of French-Canadian DNA matching plus Drouin imagery lives on Ancestry.

Our recommendation

1. Test at AncestryDNA first. Biggest database, densest pool of Franco-descendants, integrated Québec records.
2. Upload your raw file to MyHeritage for free. You gain a second match pool, a chromosome browser, and access to any European cousins who tested there—at no extra kit cost.
3. Build the tree in the documents, not the DNA. Use both companies’ tools to find candidate relatives, then confirm every link in PRDH and the parish registers.

A note on the others

23andMe and FamilyTreeDNA each have a place, but neither belongs in this particular two-horse race. 23andMe is health-first, lacks tree-building and Québec records, and carries the bankruptcy/privacy considerations we cover elsewhere. FamilyTreeDNA is the specialist for single-surname Y-DNA work, not general cousin-finding. For the everyday job of growing and confirming a French-Canadian tree, AncestryDNA plus a free MyHeritage upload is the combination to beat.

The case for testing on both

Framed as a versus, this comparison can make it sound like you must choose. In practice the most effective approach for French-Canadian research is to use both—and it costs barely more than using one. You test once at AncestryDNA, where the database and the Drouin integration are strongest, and then upload that same raw data file to MyHeritage at no charge to fish in its more international pool. Two match databases, two sets of tools, one kit.

The only real cost of the dual approach is your time, since you now have two match lists to work through rather than one. For an endogamous population that is a feature, not a bug: a cousin who appears on both platforms, or a hypothesis supported by matches in both pools, is far more trustworthy than one resting on a single inflated cM total. When the two databases agree, you can believe them with more confidence.

Privacy and data, briefly

Both companies let you delete your data and download your raw file, and both have had to reckon publicly with how genetic data is stored and shared. Before you test, read the current privacy settings on whichever platform you choose, decide whether to opt in or out of research, and keep a copy of your raw data file somewhere safe so you are never locked into one company. The wider industry has given everyone reason to take this seriously—something we discuss in the context of choosing a test.

Reading ethnicity estimates without being misled

It is worth dwelling for a moment on why ethnicity percentages deserve so little weight in this comparison. These estimates work by comparing your DNA to reference panels of people with known origins, and the panels for “French” and neighbouring populations overlap heavily—centuries of movement across northwestern Europe left no clean genetic border between French, and adjacent British, German and Iberian populations. A French-Canadian descendant may see their Québec ancestry parcelled out across several of these labels in ways that shift with every update to the reference data.

Both AncestryDNA and MyHeritage revise their estimates periodically, and your percentages can change overnight without a single new fact entering your tree. That alone should tell you how much genealogical weight to place on them: very little. The estimate is a conversation starter and a rough sanity check—confirming, say, that a family that believes itself wholly French-Canadian does indeed read as overwhelmingly French and northwestern European—not a tool for distinguishing one Québec parish, or one founding line, from another. For that, you return to the records that name the actual places.

In short, let the ethnicity estimate be the part of your results you enjoy and the match list be the part you work. Whichever company you favour, the percentages will entertain you for an afternoon, while the matches—sorted, verified, and anchored in the registers—will reward you for years.