Ask multiplatform gamers what version they'd prefer: PS3 or PC.
That's your answer.
Preference is obvious, what's actually important to sales of a new console is having games that clearly demonstrate that the console you own is being made obsolete.
It doesn't necessarily mean a higher resolution, or dynamic forehead sweat simulation. Consoles like the Wii and DS demonstrate this.
More games, sure. Are there going to be any launch day titles that make you think 'Ok, this could have never been done before, and I want it'?