Haven't seen the Gears of war pics, and I don't doubt they look better, and who even knows if they're bullshots or not. What I can say is that these are in game according to devs. How it'll end up looking on the PS3 when released, I dunno, but people claimed Ratchet and Clank early screens were bullshots and the game ended up looking better when released.
Just a side note, I don't think it's fair to compare games to Gears of War. First off, it's no longer the king really. Secondly, it's a lame comparison, because Gears has like 2 bad guys spawned in the game at a time and it takes place in small, cramped corridors. Compare that to a Halo 3 or Resistance where you're outside in the middle of a war, with vehicles and tons of friendly and enemy AI at once. Gears of War LOOKS better than Halo 3 or Resistance, but I got sick of Gears after like 2 hours. Resistance with it's comparatively ugly graphics I've beaten several times, and Halo 3 which almost looks like an Xbox 1 game I will probably play another times though or even more because they focused on putting in great mechanics at the expense of killer graphics.
-By the way, I know it's a weird comparison, but Resistance looks actually better than Gears on a standard def TV.
Besides all that, Resistance is coming this holiday. I dunno about Gears. It's possible but unlikely they'll have UT3 and Gears both done this year for 360. Are they gonna kill the 360 port of UT3? It might make sense to get Gears out for Christmas but who knows, they may anticipate big sales on the 360 after Gears for UT3.