Well, having been on 2 very different teams (67 & 1504) I have 2 very different answers.
Best in terms of most successful? HOT, 2004, the year I graduated. That machine could do anything, and until the cord was smashed into with the robot 6 feet in the air, it was unbreakable. That machine was amazing.
In terms of most fun, I'd have to say Herbie, aka the Little Robot that Could, 1504's 2006 robot. That thing would go out and score 30-40 points and because it wasn't shooting them up in the air, no one would have any idea. So the other alliance would think they'd won the match, and then the score would come up and we had won by like, 20. The looks on some of their faces were hilarious.

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This season, I was a part of a great team, with great kids who were really inspired, and who inspired me back. That's my brag, what's yours?