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I think reliability is one of the most important aspects of a drivetrain. If your wheels fall off on the field, you aren't going to be doing much scoring. Another important factor is operator-frendliness (this includes OI design), the chassis and OI need to be designed to work together so the drivers can easily use the drivetrain as it was intended. You can have the coolest, beefiest swerve drive, but if your drivers can't control it, you'll go down like a metaphorical lead blimp.