Who's the best mastered champion in the game?

I love two champions, Ekko and Aurelion, i love how i need to play them, but i want to pick one to just One Trick and focus only on it. Who's better to one trick, Ekko or Sol? I want to get out of Gold, so i need to pick the one who's good at high ranks, not like Yi or something. sry for bad english
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