If you were considering owning both... I'd buy a PS3 first, and wait for MS to actually make the 360 reliable (and maybe cheaper... who knows) in the future. PS3s are worth the investment... but I think you might be disappointed in your 360 now, as opposed to the 360s of the future, which might be supurbly reliable, like the PS3 already is.
The games aren't gonna vanish -- buy a PS3 unless all your friends are demanding you play Halo 3, or somesuch. Score a 360 later, when its a better product, and cheaper.
Cross-platform games are gonna be darn near the same on both platforms, from here on out, if the current trend continues. Look at the past titles, and exclusives, to make your decisions. Do you prefer GT5 to Forza? Do you prefer Banjo to Ratchet & Clank? FF 13 to Lost Odyssey? etc. God of War 3 & Uncharted to... whatever the 360 has for decent exclusive action? Madden, etc... they'll all be the same from here on out, except possibly Sony's 1st-party sports titles, which, I suppose, might really shine in the coming years, if they can harness the PS3.
