[Vikesrock]

something to keep in mind for those responding specifically to the OP, team 2169 had crab drive on their 2009 robot.

I think it is important to wait for the game before making a decision between the two drive systems. I also think it would be wise to keep simpler alternatives on the table.

After analyzing the game and deciding on what role you want your robot to play you can list out what drive capabilities you need to best accomplish that role. This should make it much easier to determine what drive system you want to go with.

I saw at least a few swerve drives in 2009 that did not appear to contribute to the team's strategy. I would make sure you have a reason before you expend the effort, weight and increased complexity to build a swerve drive.