Ethereum have worked their way to be in this position. Roots are important especially in the cryptocurrency industry. That means a highly trusted company/being is behind it unlike any other altcoin that was created which will be dead in a few years. That's why I pick them as my second asset next to Bitcoin.
But, when you are making a lot of transactions by now you should try something else because Ethereum is in difficult times with high tx fees. That's where Binance Smart Chain comes in. Ethereum will always be better but patience is needed up to the completion of their change to POS.
When it comes to network fees, BSC has the advantage over ETH for now.
But some are still preferring ETH because of its decentralized nature.
So as a user, it depends on your preference here. Fees or nature of the network?
If ETH will resolve their long-running gas fee problem, will people go back to this platform?
Probably yes, because its position in the market has been established already and many people are trusting this network because it is more decentralized.