Whether 'tis nobler in the mind to suffer the trolls and flames of the new champion learning curve, or to take arms against the opposing summoners, and by playing a familiar champion, end them?

So if that went right by you, let me clarify. I find myself experiencing a sort of indecision which has paralyzed my ability to enjoy LoL lately. Essentially, I am caught between two schools of thought: Should I work on expanding my champion pool (mostly for top and jungle), as well as practice roles that I am inexperienced at in order to better be able to fill what requirements my team needs? Or should I stick to playing one or two champions in each role, and excelling at those champions to the point where I win like 80% of my games with them, carrying my team with monotonous talent? I just want to make the most out of my time investment here, and I feel uneasy about either choice. Any insight is helpful!