Originally Posted by Terumoto

Q, dont listen to those guys saying you should do mixed martial arts. As a beginner trying to learn, it would be difficult to do more than one and progress in both at the same time. Mixed martial arts are more effective, the people who have been saying this have probably seen international free-style fighting competitions and noted that the people who go well in those often dont adhere to one style and use a combination of many.

Maybe once you get into a particular style a fair way, it would be beneficial for you to try out a new style if you are enjoying martial arts and are serious about it. But until then just choose one and go with it. It looks like you've narrowed it down to Muay Thai and Judo. Just do a bit of research on both and see which one appeals more to you. By the way, Muay Thai may be referred to in America as Thai Boxing, so if youre having trouble finding a place for it that might be why.