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 if you're talking about capitalization, it is now all clear-Ripple. This project is held purely due to the fact that it is not perceived as a crypto currency and the fall of the industry does not affect it in any way.