Computer monitors are not that limited.

Also, the PC UI can be RESIZED. Mine is heavily customized and shrunk down, it probably covers as little as the PS3 UI does if not even less as a result.

The PS3 version is great for people who don't have a mid-range PC or above, but frankly the moment your PC is able to handle today's games I can't think of a good reason to go for the PS3 version over the PC version.

It still comes down to personal style, though.