The C's have much more game 7 experience than the Lakers. Just about everyone on the roster has played in 4 game 7's over the past few years.
The Lakers only have Fisher + Kobe with some big game 7 experience
Lamar Odom only played in the one the Lakers lost to the Suns in the 1st round
Artest played in a few, but can easily go into panic mode in a pressure game
Gasol has never played in a game 7 to my knowledge
The bench has no game 7 experience
Phil Jackson has never coached a game 7......
EDIT: I totally forgot about game 7 vs houston last year, but does that really count without Yao playing?