In the past, I would have said the 360 quite easily as the PS3 had nothing of note in the first couple of years. Now, I would say the PS3 quite easily due to having a stronger lineup of exclusive games and Playstation Plus (the latter making X-Box Live look extremely poor value now).

Since having my PS3, my 360 has hardly been used and I cancelled my Live subscription after having it for 8 years.