They would both be good options for natural therapies, but which one more people would want unfortunately depends on your area. There are some cities that have plenty of some and not enough of the other (in which case, that may make an impact on which one you'd like), but you may not want to do it just for the money. Natural therapies are some of the harder "self employed" options to make a profit on and practitioners are seldom in it for the money (as many other professions make more money), but more for the knowledge that they are helping people live better and healthier lives. Also, there's the fact that without an existing clientele base, it's really hard to keep a natural therapy business open because of the cost of keeping the doors open (rent and whatnot).
It's very admirable that you're looking into natural options like this, but I would do something you enjoy rather than something that you can make money on... if you hate your job, it won't matter how much you make if you're miserable. Good luck and I hope I helped!