I did 23 and Me about 4 years ago, I think. It was very interesting, both from the ancestry standpoint and health & traits genetic information. I recently (over the summer) did Ancestry's test, too. Similar information to 23 and Me, but I'd say better in that regard as they only concentrate on the ancestry part.
I'd say, if you care most about your genetic history, use Ancestry. If you want the genetic history PLUS a lot of other information, then use 23 and Me. I recommend 23 and Me as you get "more for your money".
-Samantha Jones, SatC