Samsung I9000 Galaxy S vs. Samsung I9100 Galaxy S II

I have Samsung I9000 Galaxy S. Buy used Samsung I9100 Galaxy S II or not? How much better is Samsung I9100 Galaxy S II for Games?
Answer #1
in SII the processor as well as the GPU are upgraded so better performance than Galaxy S.
Comparison:
http://www.gsmarena.com/compare.php3?idPhone1=3115&idPhone2=3621