Yup go PC!!! Hahaha I'm now in that process, anyhow, even with the PSPlus service, the prices don't even come close to Steam prices. I mean, it is abysmal.
I think it is irrelevant that you pointed out PS3 was 100-200 more expensive than XBOX360 6 years ago, since he is going to buy a console in this period in which you can buy a brand new PS3 Mini for $299 bucks. The slim version of XBOX didn't gave solution to the mandatory AA batteries, the need of buying every other peripheral especially designed for XBOX360 and the obligatory subscription to XBOXlive if you want to play online.
But hey! Look at this, you have TheGhxst giving good points for XBOX and me giving (you decide if they are good or not) points for PS3. So the conclussion is, don't take advise on us, like TheGhxst said, go to gamespot or some other videogame database website to look for games that you like or would like to play so you can buy the system in which those games are!