I remove 2 of your exchange list on my exchange list.
Because they have some problem on the platform, you already describe the problem from the article. Honestly i only using 2 of your exchange Binance & Huobi.
I guess we cannot say which one is the best. There are several of them, including these ones that you have mentioned. Simply, for me, everything depends on the rates of the exchange operations and on the availability of the pairs to make this exchange.
Binance seems to be the most universal exchange. It has many cryptocurrencies, and the rate there are good.