Both are good, depends on what you want. Binance is preferred today over ETH because of it low gas fees. But also, BSC has its own shortcomings.
Some project like to build their projects on the ETH network because of ETH usecases. ETH is considered the biggest layer one protocol, maybe when they deploy ETH 2.0, the high transactions fees will be taken care of.
So, I wouldn't say which is better between both, it only depends on what you want