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Train in Muay Thai according to JKD principles. JKD isn't an art in and of itself. It's Bruce Lee's approach to training in martial arts in general. Train in depth in the best martial arts available near you. Keep what works and is appropriate to your body type/fighting disposition and dispose of the rest.

Almost every MMA fighter in the UFC has a Muay Thai teacher, very few have a Jeet Kune Do teacher. The fact is though, someone who bases their Martial Arts system on JKD could incorporate Muay Thai into it, plus some BJJ, and ofcourse would destroy someone who just done Muay Thai. JKD is basically just using anything that works and learning as much as you can, and just keeping what is good.

Muay thai was added to jeet kune do by Inosanto; part of jkd is kickboxing.

As a general rule, I would only go to a "jeet kune do" school if the sifu is certified by a student of Bruce Lee himself, and can verify it. Muay thai is the best foundational art.

JKD would be the most complete of the ones you suggest but finding a good instructor is almost impossible,also its more for self defence not competition.i would go with muay thai forget kickboxing its the girls form of muay thai.

if u want to compete, then do muay thai