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If this is the first test for your family then 23andme, because you will also get your yDNA and mtDNA assignments. MyHeritage has a slightly better resolution for autosomal DNA than 23andme v5, but at the end of the day they are not that different here. Once you have yDNA and mtDNA, you can upload your 23andme data to MyHeritage and test the rest of your family with MyHeritage, as it's cheaper, faster and has a larger database of DNA matches.
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