If you are talking about the overall ancestral DNA testing it can differ between different companies as the only thing they can do is match you with population samples in their database. So if one company doesn't have or is deficient in certain population samples another has and vice versa, the results will usually not be exact.

Understand they use the Autosomal DNA along with the X. Autosomal is more complicated than Y& Mitochondrial. Y & Mitochondrial testing is respected as being very exact. With each they will assign a person to a Haplogroup and show that person the origin of their ancestors going pretty far back in time. The only thing about it if you are a male you got each from only one person in each generation you go back. Get back too your 32 great great great grandparents and 30 of them will not be included in the results. If you are a female normally you only got Mitochondrial from only one person in each generation you go back. So 31 of your great great great grandparents will be excluded.

You have 46 chromosomes. Two sex chromosomes. For a male a Y and X. Normally for female, two X, one from each parent. Mitochondrial is not a chromosome but in the connective tissue outside your cells. Both males and females get Mitochondrial from their mother only.

Your other 44 chromsomes are your Autosomes and you get them 50-50 from both parents but when your parents passed on the Autosomal they received from their parents to you it went through "meiosis" where it was randomly jumbled and recombined. So while you got 50% from your mother's side and 50% from your father's, there usually will be a bias in what you inherited from grandmother and grandfather on both sides of the family. In other words you could have inherited anywhere from 0 to 50% from any one grandparent. The gap usually isn't that big but can be. How you inherited any bias will not be how your siblings inherited it unless you have an identical twin. So even if you and a full sibling were tested by the same company at the same time the results will vary. Example: You might have received more Scandinavian Autosomal from a Norwegian grandfather and your brother or sister might have received more Slavic Autosomal from a Croatian grandmother. There are no Haplogroups with Autosomal.

Which is the best company to use. The company that has the population samples that best match your ancestry and there is no way we or even you can know that. The best company can be different for different people.

Also the X for males is a little different. If you are a male you got X from your mother but she got X from both her mother and her father. Whose X did you get? Your maternal grandmother or your maternal grandfather/s? No definite pattern. It can differ among brothers who share the same mother.

The real value of genealogy DNA testing is if you are into traditional genealogy work using documents/records and if the company you choose has cousins of yours going back several generations in their database and if they are allowed to notify you of those cousins and they are also into traditional genealogy work, by making contact with them you can collaborate information with them. You might have discovered things they haven't and they might have discovered things you haven't.

They do it with microfiche (which are cards) and microfilm; not with books, newspapers, hand-written wills, . . .. there is a nominal charge. The volunteers at your local FHC can explain much better than I can.

Off-topic, but I could not resist:
Q: What do Catholic elves eat for dinner on Friday?
A: Micro-fiche
Ho Ho Ho

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