betta types

Hey everyone, I'll be getting a new betta in a few days now, and I was wondering which type is hardiest against diseases/has the least genetic problems? For instance, I heard that halfmoons are big tail biters, pure red bettas in general are super inbred, and doubletails have short bodies and...

ok so a friend (I won't name names) had an argument on what tail type my betta is she keeps saying it's a round tail and I'm saying it's not can someone please help put this to rest cause she's not dropping it thank you