25
Pros - One speed. 4 motors. Could push anything with no problems turning. Fast.
Cons - HEAAAAAVVVVVYYYYYYY
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254/968
Pros - Light. Multi speed. Modular. Easy-to-adjust. Not many turning problems. Fast.
Cons - People rode up over their cantilevered wheels. Lots of precise machining required.
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237
Pros - Made in one day. Free (used KOP gearbox and wheels), fast, easy to drive, turns on a dime
Cons - Easy to push.
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These are just my opinions of teams that I was able to play with or against this year.