Being a fan of the survival horror genre, my top franchises are Siren, Silent Hill, and Fatal Frame. And Resident Evil isn't my type of game. With that being said, Siren is a PS3 exclusive, and for those who want to use rankings as an excuse Silent Hill: Homecoming PS3 has the higher ranking over the 360 version. Also, the first person point of view isn't my favorite so it doesn't bode well for the Condemned franchise for me. And we know so far that Fatal Frame IV is only on the Wii. That's means the PS3 and Wi fits my survival horror needs.
Also, I like platformers. And guess what? You have Ratchet & Clank Future: WoMD, Ratchet & Clank: QFB, and Mario Galaxy which I'm a huge fan of both Ratchet & Clank and Mario, all quality games. And knowing SONY and Nintendo, I have nothing but high hopes for the platforming genre from those two companies in the future.
Also, I'm am RPG fan, but enough of the franchises on the 360 do not interest me such as ToV and Star Ocean, tried the franchises and didn't catch on to me. You also have exclusive offerings from Altus, but those games are too risky to spend my hard earned cash on when I know I have better choices out there. And most multi-platform RPG's that are on the PS3 are better such as Enchanted Arms, Oblivion, and Eternal Sonata with FFXIII Versus being an exclusive as examples
I do not let numerical scoring ultimately decide what I want. I decide what I want from the details I've researched. My gaming preferences are not the same as others so it is not better than anyone else's. Therefore, no one should claim that their opinion (or claim that anyone else's like pointing to Metacritic because it does NOT prove which console has a better library) is better than someone else's. As I gamer, I will never say that my choices and preferences are better than anyone else's because it's just opinion whether it's popular or not.