What is better for women jujitsu or muay thai?

try some classes first then decide. any martial art if you enjoy it and are motivated will be best for you. the instructor can make a bigger difference than the art. Self defence is something else. look at what's available near you, what times are best for you to fit round school work and parents. most clubs offer a free first session. so go along see if you like the place, the teacher, the other students. you will need to find other girls to spar with if you want to get good at any martial art. guys either take it light out of respect or act like numpties and hurt you to prove something. the club should make you feel welcome and have good discipline, a safe, clean training room, instructors should have full qualifications in their art, first aid training, coaching certifications and enhanced crb clearance. All martial arts are ok for women. train regularly and smartly and it will be the other factors that decide how effective the art is for you. I've done karate, ju-jitsu, kung fu, tai chi, krav maga and learnt alot from every style but i got good at the arts i practised most at clubs that treated me with respect.