If you don't mind the size, note II every time! Same phone more or less as the GS 3 except bigger and better screen, better battery life (however, you can buy a official samsung 3000mAh battery for the GS 3 for about £30 so battery life will be better than the note II)
However, there is no point doing anything yet as you have the next lot of phones coming out very soon, xperia Z, HTC one/M7 and then the GS 4 in April.
If you badly need a phone now and can't handle the size of the note II, then either the gs 3, one XL, X+ or nexus 4 (IMO all those other phones are better than the nexus 4)