I've seen both on the track and the K1 takes the honours so far, but then in the defence of the xb4 it was hastily set up trackside with an esc dropped straight in from a TC with all the boost and turbo maxed out. It travelled at the speed of light in a straight line but was inconvenienced by some silly corners that got in the way. The plus side to this though was that it was able to keep going with no breakages so its obviously pretty durable!
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