I think who wins in a fight depends on three things: student style circumstance I imagine a heavyweight boxing champ could beat a poor jujitsu fighter even though the boxer's style is designed for the ring and doesn't cover leg kicks, groin shots, ground combat, etc. However, if the best boxer in the world and the best judo guy in the world fought no-holds-barred, I'd favor the judoka because he his style encompasses a much broader range of techniques. That is, unless they fought in a regulation boxing match, in which case the judoka might get his clock cleaned. However, a very good judo guy would probably prevail in that same ring against an out of shape, overweight, poorly trained competitor no matter what his style. Etcetera. So much depends on student and circumstance. Muay Thai is certainly a fine art, but the problem is that people usually evaluate it in a competition context. It's like the MMA guys saying "karate is junk, look what we proved in the octagon". Take away half the strikes, put on pads, add other rules, and yes, karate may not be as effective. But that is one circumstance. Other than a few junk homebrew systems that I've seen and maybe one or two systems I've found to be questionable (just my opinion), the majority of traditional martial arts are very valid and potent in the hands of a good practitioner. Given that, how good you are is mostly up to you.