I find coingecko's ranking to be relatively objective and reliable at the present.
1 Binance
2 Kraken
3 Bitfinex
4 Gate.io
5 KuCoin
6 Bittrex
7 Poloniex
8 Coinbase Pro
in what world is kraken #2 and coinbase #8?
according to the BLX, kraken's BTC/EUR and BTC/USD markets
combined represent not even 70% of coinbase's BTC/USD market by volume.
gate.io at #4?

this list seems like an attempt to hype up some smaller exchanges by mixing them in among real, high volume exchanges. it doesn't look objective at all.