hey man you need to train both to be an effective all around fighter. I’ve been traing both muay thai and juijitsu for 3 and 5 years respectively. It has been shown in mixed martial arts to be the two most dominant styles. If you have to choose between the two I would advise starting with jiujitsu since most fights go to the ground either way. Jiu jitsu teachs leverage and technique over power vs. muay thai power and speed. Good luck with your training

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