https://www.cryptoadvocate.net/post/best-cryptocurrency-exchange
Nice article but i think there is also some great exchange you missed. Binance, Kucoin, Bitmex, Bybit is really good for their position. Other exchange you mentioned which are not popular in crypto market i guess. I think OKEx, Coinbase, Huobi Exchange, Fatbtc, BitForex are also good competitor for your article. New exchange VinDAX is also quite good exchange for lower fee category.
Bittrex was once the market leader, now practically dead. Same with poloniex. Old exchanges that don't innovate dont last