bro there is hella lot of techniques in those disciplines to learn, size of an opponent is valuable also weight and etc, ofc you wouldn't do a suplex against 200cm/200kg guy when you are about 60kg/150cm by yourself, he will just fall upon you (that's an absurd, but example)and in fight you wouldn't care much about calculations, like in anime or something


you better go in mma school or any mixed martial art, it also would be much better, and you will understand what kind of techniques easy for you to learn, anything can be suitable in case of self-defense against a guy which is just larger


if you okay with striking, but bad with grappling/takedowns or whatever, you should choose something more specialised which focused exactly on stuff you don't understand, it's like a matter of practice and time


i can be wrong, but it's better to start from "neutral" territory, which can make a suitable introduction for you, how the hell it feels to fight against people which is more experienced than you, almost at anything (well it feels bad, lmao, but anyway) and after that, you ofc can go to boxing school or judo dojo


sorry, language barrier