30 million accounts don't mean they all trade on Coinbase, because I know a lot of people choose Coinbase to store their Bitcoin. As for Binance, I don't know how many accounts are available but I'm sure the volume volume on Binance is always more than Coinbase
Daily binance transactions are currently greater than coinbase. Maybe there are more coinbase members but if you look at the number of transactions, I think the binance more bigger. For exchangers, the number of members who register is not a measure because the exchanger gets money from every transaction made by investors