If it's about the best exchange, I choose Binance as the best exchange in 2020, and I don't use the other option from @OP. I wonder why BitMEX is not on the list because BitMEX is a good exchange so far. KuCoin is also not on the list, so I think @OP can add more options to have more exchanges to select. This year, I think many exchanges will try to compete, and maybe Binance will have more competitors at the crypto exchanges. But I am sure that if Binance can manage or maintain their services better than before, they will still be the best exchange this year.
Binance is still number 1 tho cant really deny that fact, its the biggest exchange in the cryptocurrency market even up to this date but yeah in terms of their performance I think they are having a hard time maintaining their good services as based on the complains or problems am I seeing from their exchange but so far still good for me, I am also using Kucoin as my exchange, its actually the most often exchange that I am using compared to Binance and Okex, still good one imo got good offers too and still good volumes on their exchange, using it often coz they got so much offers that I am earning with like their staking and the recent one which is their trading bot and which I think binance doesnt have yet also their APRs for their staking products. Using them often now coz of XRP, they had events for it even though its facing some crucial point right now volume still good imo you can see it here
https://trade.kucoin.com/XRP-BTC...
I think there are more exchanges with good services too which I havent tried yet but I am looking forward on using and trying their service.