Both games will be good, but they will appeal to different people. They're TPS and FPS.
I read someone say that textures are way more important in terms of graphics than the modeling itself - you're out of your mind. I do 3D modeling, to the naked eye - yours, who has no experience doing this - maybe. It's harder to put high poly models in a game than high res textures. I look at graphics in a more technical way because I've done 3D modeling. If you haven't, you have no clue what you're talking about. High res textures is a way to make up for lack of high poly models.
Anywho..
Resistance is a generic type of shooter. That being said, I prefer Resistance over Gears by a long shot. The weapons alone make the game much more fun, but the physics are what separate this game from, say, a Call of Duty. Many won't agree with me, and it will probably be mostly people who only have a 360 - though some with a PS3 that like Resistance will still disagree - but I strongly prefer Resistance over even CoD4.
The online multiplayer will destroy Gears online multiplayer by a long shot. The only inovative thing that Gears brings is the Horde mode or whatever it's called that's basically a survival mode. It sounds like tons of fun, but Resistance game modes were already very unique when it came out, and still has the best game types of any online FPS out there.
It's not made a lick in Halo's shadow..Halo 3 - as I've said 10 million times - was a huge let down. It wasn't a horrible game, but it wasn't worth $60. It was a Halo 2 expansion pack that was worth, at most, $30. The game types in online multiplayer were generic, things every game has. They brought nothing new to the table. The gameplay was the exact same as the first, and the graphics were almost the exact same except HD. The storyline in Halo as a whole was one of the most pathetic and spastic storylines I've ever witnessed.
Resistance 1 is much better than Halo 3.
Gears of War, in my opinion, should be compared much more closely to Uncharted because they're both 3rd person shooters. Unfortunately, there's no Uncharted 2 coming out as of right now, so we can't compare the sequels. I loved Uncharted and I think it has better graphics than Gears of War, but I think Gears of War was a better game for the Genre. The graphics weren't that much worse, and you had much better control over your character and the weapons were better. The story was much larger in scale, which always lends to the experience of playing a game. While I didn't exactly enjoy Gears, I find any types of shooters better on Playstation for the simple fact of the controller. The 360's offset thumbsticks kills the FPS or TPS experience for me and always has since Halo 2. Halo 2 was just a good enough game to keep it going for me, much like CoD4.
All of that being said, I think Resistance will be a better game. The Campaign modes is a huge advantage for one having the separate campaigns for single and multi-player, and the geometry randomization that changes the landscape every time you play a level over will make the campaign never really get old.
The online multi-player will be much better as well, because of the scale alone. On top of that, as I said above, the game types are going to far outpace Gears 2 simply because no game has come close to as good of game types as Resistance 1 and I expect 2 to have most of, if not all of them and more.
That being said, I think Gears 2 will rate higher. There are more 360 fans that want their console to be better and will rate Gears as amazing whether they truly liked it or not. I find there are more honest gamers on the PS3 - not necessarily this website. I clasify truly liking a game as a game you play months after it's release, beyond when another decent-good game for that genre comes out. There are going to be a lot of people who buy Gears 2, get online and say it was awesome, and stop playing the game 2-4 months later. There will be more people who buy Resistance 2, get online and say it's a pretty good game, and continue to play it 6-8 months later.
My 2 cents - obviously a little biased - so take it as you will. At least I honestly gave Gears 1 it's chance and played it before I decided I didn't like it. And my stats on Resistance for online speak for themselves.
Just 1 other thing - No other game online has or apparently will ever come close to tracking stats as well as Resistance did. Not even close. The stat system on Resistance is so far better than any other game, it's not even remotely amusing. I wish all games would take a page from Insomniac as far as that's concerned, but unfortunately most won't JUST because they'd be worried about it being considered 'biting' Resistances style. I for one, wouldn't care about that, I'd like to know exact kills and accuracy for every weapon I've used, including grenades, in every shooter I play. I guess that's too much to ask, so I'll stick to Resistance where if I'm good and I say I'm good, I have extremely detailed stats to back it up. You just have a win % and accuracy %, and nothing else.