Bitcoin will be always king as its main coin. ,
Second ETh as all the other airdrops are linked with ERC20 wallet.
Third - EOS - it supports new companies also. also it linked to some Airdrops its a chinese coin.
Indeed if we predict bitcoin aka this is the main coin, because later all the coins are finally converted to bitcoin including ethereum but for quantity of transaction of course I agree with you. Ethereum is the most dense current transcription because all alt coins are converted to Ethereum before converting to bitcoin.