Gran Turismo 5 > Halo 3 - Sales wise?

[Omega_Phazon_Pirate.]

I noticed the TC just called someone a kid just because someone disagreed with him *gasps*.

As for on topic, that would be a tough one, but I'd say more likely Halo 3 mainly because of the PS3's not-so-high install base as well as Halo 3 starting to be bundled with Elites.