video game systems

Ok so i have been a big gamer for a long time mostly playing world of warcraft and had a ps2 which i was a big fan of. I go to my friends house like everyday and play 360 and stuff. My ps2 just broke and i dont know weather i should get ps3 or 360. For 360 i love halo and like every other game and i want to try out ninja gaiden 2 which is only for 360 but i also want ps3 for heavenly sword and for all my old ps2 games which one should i get.