For me, ETH will always be better than BSC. Due to the low gas in ETH I recently started using ETH even more often than BSC. There are no innovative projects in BSC so I don't think I will be here for a very long time.
I think it's still a balance between using the ethereum network with BSC, but I'm not very good at airdrops at the moment, so there's no further explanation regarding network usage in the airdrop, but in my bounty participation I saw a lot of good projects that use the ethereum network, although there is also a BSC network, but most of the good projects nowadays use the ethereum network, believe it or not you can find out for yourself on bounty.
Nope, eth fees are a bit higher than BSC fees and nowadays, many new projects prefer to run under BSC network instead of the ethereum one. Due to my daily routine in hunting airdrop on bsc's projects, I use BSC more than ethereum.