After giving the EVO 3d a trial, I have a feeling I'll be going with the GS2 when released ~ Jul 24th. Aside from the slightly fragile build quality on the GS2 (which can easily be remedied with a good case), there is just way more pros going for the GS2. These include silky smooth performance, 1080p video rec, much better pic quality (samples from the European forums), samoled+ looks way better than the evo3d, 20+ hours with 15% still remaining on the battery. The debate between Sense and Touch Wiz is a moot point as I think both will be able to root and run our own ROMs. I know this is an EVO 3d thread and I was really excited about this phone. But across all the reviews so far, there seems to be enough drawbacks, including only 720p vid rec, mediocre 5MP cams, inconsistent voice quality, qhd screen good but not great etc...to sway my decision...
If sprint maintains most of the european form factor of the GS2, I don't see why I would choose to keep the EVO 3d over the GS2.
Samsung Galaxy S II review -- Engadget