Same here. I have a blackberry 9300 that I've been squinting at for months and I've been seriously considering this phone over the sg2 but the price is a bit high.
So tell me...Why should I pay 100 bucks more for Bionic if Att comes out with a 199 price tag for their new Samsung galaxy 2 phone especially when I'm already an Att customer with an unlimited plan?
Verizon's network is much faster, and they are generally much more reliable than ATT. That would be the argument, but it comes down to preference on the phones. If you'd be happier with the SGS2 then get it. Also you would not get unlimited data if you switch to verizon, so if you are a heavy data user, not around wifi much, then maybe you should just stick with your ATT plan.
I saw some say Motorola phones are better built but is the Bionic really a better phone than sg2?
It figures to have a better radio, some people prefer the build quality of moto phones... but overall why don't you just wait until both the phones are in stores, then go in and play with them yourself and make your own mind up. Nobody can tell you what you're going to like more... especially regarding a phone that nobody here has in their hands now.