I'd love to know what exchange you think is *actually* the best, if not Binance. There are others I use that seem to be just as good, like Kucoin. Polo was decent, but they're ditching U.S. customers...so I actually do think Binance rules at the moment. Yep, some other exchange may take its place eventually but it hasn't happened yet.
Being from the states, I'm really only familiar with a handful of them. I know there are many in Asia and they might be just fine, but I haven't heard of many of them and I don't know if they're reputable or not.
Okay, please let me give my opinion about an exchange.
We are now in decentralized space. Even though we actually live in centralized system (government, banks, etc), but we are mostly active on decentralize area.
Binance, Poloniex, Bittrex are centralized exchanges. Centralized exchanges are sometimes good but later they will be just other centralized systems. They will eventually be the same.
For me, there is no best exchanges among those centralized products. Once we think it's the best and we start believe it, we could lose our mind and agree with every decision they take, we would never think they are wrong even though. Why that matters?
Cause in the decentralized world, we should not trust no one. Being skeptical is good.