it's hard to answer this question, when we have no idea what you're hoping to gain from the instruction.... what are you hoping to achieve via martial arts?
pretty much any structured courses in any legitimate martial art would be fine if you're hoping to learn more discipline, endurance, flexibility and self defense.... so again, what specifically are you wanting to get from it?
are you looking to be a badass on the street?.... re-shoot the old 'kung-fu' tv series?.... live out the 'kill bill' dream?... compete in the Olympics?.... what?
i've been a practitioner of krav-maga for many years, so i'm obviously an advocate for that style, but others want something more structured and appropriate for competitions/tournaments... others just want to get in shape and learn how to properly throw and defend a strike.
can't answer, because i don't know what you want from it..... maybe you can edit this question, expand upon it a little bit... that would help make it possible to offer you a meaningful answer