Motorola Atrix 4g vs. Motorola Droid Bionic
I pick a carrier then find a phone not the other way around. Just my opinion.
+1, that's really the only way to decide. Find out who has the best services based on what YOUR needs are. Coverage in your area will probably vary depending on carrier also. Bottom line is, most likely you're gonna be stuck with this carrier for 2 years. Make sure it fits in your budget, then worry about what phone you're going to get.
The Bionic is similar with capabilities, speed and memory, however, it is from Verizon. The service provider makes all the different to me when the phones are virtually similar.