Best junglers right now ? Aswell as ADC ?

So I bought Zac I'm gonna train with him. G4 elo player here. I main Lucian ADC the only one I pretty much play but I can also play Vayne. So if I can't go ADC then I just go jungle but I always go jungle with Jax right now. But my main question is... Can I climb ranks with Zac jungle or Lucian ADC ? Really good champions for each role ?
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