Optimal mid lane champion to play in higher ranks?

In lower divisions, Ryze and Talyah are being seen as "troll picks", now in middle of Platinum i am finding it hard to keep up with playing Lux, ESPECIALLY versus Ryze. His damage is just a living nightmare. But anyways, i am trying to ask high elo players, what is the best mid lane champion to play? Should i stop playing Lux for Ahri? Or the other way around? I need some help. {{sticker:sg-lux-2}}
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