Which are the best competitors to Ethereum, and why do you think so?
(I know on top of my head that Cardano and IOTA try to challenge Ethereum,
although they still haven't proved much from my understanding?)
I think the best rival is EOS, if EOS really can do what is advertised, then EOS will exceed ETH in any case.
Now, NEO, QTUM also looks like a strong competitor for ETH, but the closest to ETH is EOS. There may be other views.