Barring release date and 4G LTE
between SGII and Bionic, I will be going with Bionic.
Why you ask?
First, build quality is very important to me. Bionic is aluminum, SGII is plastic.
2nd, Bionics form factor looks better, just slighty, both are not very attractive
3rd, Blur is not as ugly as touchwiz
although SGII does have better things over Bionic as well, but the ones i mentioned above edges it out.
1st, Touch Wiz 4 is better than blur despite being uglier
2nd, not confirmed but SGII is slimmer, doesnt really matter to me
3rd, the biggest edge it got is the screen