I have every each character at level 70 and also paragon level over 300 at HC.
In my opinion class for playing by human best is like always - class u like play most.
But if it comes to botting, there are few setups for doing it, but in each profile u can make a build great for botting. For example Im using my WD for everything, ofcourse I know that barb could handle t5, but t4 is enough for my WD and he wont die. Maybe if ill play more at other characters i could make this with another class too