I have a PS3, which I love.
PS3 has Blu-ray (with 3D support), better exclusives IMO, and free online play which appeals to me as a person that generally plays offline anyway.
The only thing I find disappointing is fact some multi-platform games run better on the 360 (ex. Skyrim and Bayonetta). This can be due to nature of the engine used, the fact the Xbox is easier to code for and preferences of developers. Multi-platform games sell better on the Xbox more often than not so it makes sense for developers to cater to 360 users more than PS3 users.