I used FTDNA go to their site for the price.
(1) FTDNA were pioneers, and IMO a little more technically astute than Ancestry
(2) Ancestry has better tools to work with searches and matches.
(3) Trust factor is less with Ancestry. Right now there is uproar in the genealogical community about their decision to discontinue support for the Family Tree Maker Software. Even with the pitchfork anger, Ancestry is ignoring us.