In my opinion, pick the car in which parts are easily available or obtainable from your LHS. Like others have posted, all three are about equal in quality and performance. If you have the opportunity (and deep enough pockets) to get all three, do so, evaluate which one suits your driving style, then roll with the one you select. That is what I did for my touring car. I had a NTC3, Serpent, and Mugen car at the same time, ran all three under club and big track race conditions, and evaluated for my style of driving, and then chose the Mugen (MTX2 at first then the MTX3 when it came out) because it best suited by driving style and parts were easy to obtain from my LHS (which stocked plenty of spares and sold the kits).