We advocate doing DNA tests for genealogical purposes. DNA testing is not required to do excellent genealogical work, but it can help break some roadblocks or just help discover new cousins that have those long lost pictures!
But testing at just one company is like only fishing in just one pond. Some of your relatives might pick a different sale this month, for example. So I always recommend that you test at each of the “big 4”: AncestryDNA, 23andMe, MyHeritage and Family Tree DNA.
That can get expensive! That is why we always mention sales around here.
Picking which place to test is a subject best suited for our DNA Discussion Group. But it is important that you remember that AncestryDNA and 23andMe do NOT accept data file uploads while MyHeritage and Family Tree DNA DO accept DNA data uploads at a considerable discount in price. Perhaps testing at AncestryDNA or 23andMe first might be a good idea for some.