Muay Thai would be an excellent choice.
To parrot what others have said: Quality of the gym is important.
Another thing I'd add is make sure whatever you choose has live sparring. This rule of thumb alone will eliminate 90% of bullshido gyms. Muay Thai would meet that standard.
Only counter argument I'd have against Muay Thai is the high injury rates. https://pmc.ncbi.nlm.nih.gov/articles/PMC5315252/