Konami admits that the PS3 is the most powerful console

Konami and the team behind Silent Hill have looked at the current consoles and concluded they all have limitations that hamper their ideas for the game and delay progress. Except the PlayStation 3. No multiplatform plans as of yet. But the sales of PS3 are slow so they may have to reconsider later on down the road if things appear dismal. Which of course means delayed progress and not taking advantage of the PS3's power. Tsuboyama claims Blu-ray will be a very necessary asset in their development of the game. The PS3, he says, is tough to work with, but when they get used to it, the processing power will be far beyond the other consoles.

http://www.ps3fanboy.com/2007/05/30/silent-hill-5-interview-if-ps
3-sells-it-could-be-exclusive/