comparison of a low level computer to a ps3 then the ps3 will be better by far. if you want to compare a mid-high level computer to a ps3 the computer will blow it away.

if you have the funds to invest in a nice gaming rig then that is the way to go. if you are strapped for funds i'd say go with the ps3 unless your base comp is good enough now to take a few upgrades and not do the same thing.