well, depends what you're looking for?
i duno alot about xbox as i dont own 1 but ps3s have a web browser, bluray playback, backwards compatibility with games, and now have 3D support. also in the UK we have BBCi player, STV player and 4OD (online tv catchup services) available from the XMB which is cool
the things i dont like about playstation3 is;
1) PSN, its not very comminuty friendly an no rules are enforced, theres no admin and ppl can say and do what they like unlike xboxlive where ppl get banned for being retarded
2) web brower, i know its a console for gaming but seriously why add a web browser that doesnt work? its pointless and frustrating, no flashplayer or java and a waste of time and effort imo
3) they removed otherOS on a whim
ill leave it to someone with an xbox for the other half, ive never used an xbox