Great question.
I own the 360, PS 3, and Wii., my main console is the Xbox 360, though. Why? Simple, Xbox Live.
The ease of use that we've grown accustomed to with Live is no where to be found with the Playstation Network. I am so used to having content download in the background, or chatting with friends anytime I want to. It's tough to describe, so you'll eventually see for yourself.
This does not mean that the Playstation 3 is a bad system, hell no. I love my PS 3 because it has great build quality, plays blue ray movies, has a internet browser, and plays video games. My favorite games are Ratchet and Clank, Uncharted: Drakes Fortune, and Echochrome.
In the future you will be happy to own both, so enjoy and congratulations on your wedding.
