Muay Thai is probably the best striking art if you insist on taking one. However, in a fight with kickboxing rules, the kickboxer would lose more than a boxer would in boxing. This isn't because kickboxing is a worse striking art, but because kickboxing doesn't allow leg kicks. In MMA, the kickboxer would likely win, because the boxing stance is extremely prone to leg kicks. Thats the whole reason for the 8 kick rule, no leg kicks makes it very difficult for a Kickboxer to beat a boxer. With leg kicks, the kickboxer should would handlidly.
So all in all, if you only can chose KB or B I would take KB because it's more complete.
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