Guy on the right.
Guy on the left got that way either through gear or genetics and neither will allow him to give me useful input.
Guy on the right is much closer to my build, and probably got where he is by doing the right things.
Discussion
It’s impossible to achieve any of these bodies naturally. And even if it was, it doesn't mean that he understands what he did and can teach you. Judging the experience by the looks is ineffective.