Just found this question that I answered earlier was closed because it's opinion based.
It's regarding what Champion is currently strong. The question makes sense because LoL is a game that is updated every two weeks, often changing completly the dynamics of the game. At the End of the Competitive Season a set of changes were put foward which made 3 sets of characters extremely strong, and both in theory and factually they are miles away from other champions (as confirmed by the winrates and change in average score).
The question was put on hold because it's opinion based, yet there are several data sources to be based on a non-opinionated answer. Why are LoL questions constantly being closed for the same reason, yet that reason being completly invalid?
Yes, which is "stronger" is usually a bad question on most games:
In Tekken is Kazuya stronger than Jin or Heihachi? It depends on the player, because the combos change, but their inherent power doesn't.
In Crusader Kings is a high martial ruler better than a high intrigue ruler? It depends on whether you want your military to be really strong, or you want the ability to murder people and get away with it.
In Football Manager is Ronaldo better than Messi? It depends on your tactic and the role you want to put them in.
However in League of Legends, that relativity is really only there if we're not talking about 1v1 laning phase scenarios, like the toplane mentioned in the original question.