I personally love breck, but Vail is massive, and got some amazing skiing. If park is your thing you cant go wrong at Breck, plus you can always hop on a bus for night skiing and keystone. As far as night life goes Breckenridge is a great place to get shitty. awesome bars and chill people, although some of the year you get a shit load of texas assholes rolling through. Personally i find breck to be less stuck up and snobby than vail.
As far as transportation goes you can always take the Colorado mountain express, but it can be kind of steep. Im not sure the exact prices though.