I wasn't aware that Resistance had outsold Halo 3 in the PAL regions, so my initial reaction to the question is void. That said, I don't think Resistance will do for Sony in Europe et. al. what Halo has done for Microsoft in North America. The Halo series is arguably the biggest gun that the X-Box line has in its favor, and its responsible for much of Microsoft's console success here.
In contrast, I don't think too many people buy a PS3 primarily to play Resistance. It may move a few systems here and there, and its moved plenty of units, but I think the formula is more "buy a PS3 and maybe pick up Resistance" than "Buy a PS3 so that I can pick up Resistance."







