Role Difficulties & Why do you main your role?

For a long time now I've been bouncing around in all the roles and I've had varying degrees of success and enjoyment in each of them. It got me wondering; what roles are the easiest and which are the hardest? So I figured I might as well see what others feel. What do you in _your personal opinion_ think is the hardest to easiest roles in league of legends? And with that, why do you main the role that you main right now?
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