I think etherem is an old altcoin that can evolve with the times, so the features in it attract the attention of everyone who wants to develop their projects using the ETH network, and as evidenced by the number of successful projects using the etherem network, although the transaction costs are quite large but very according to its expensive price and the process is also very fast,
And the transaction cost is so high because the number of transactions happening on the ERC-20 blockchain is massive. I am expecting a solution to arrive with the launch of Eth2.0 because they have promised a lot and everyone anticipates big things with its launch.
The closest in terms of liquidity is BSC and TRON. They look good and they have little commission.
I always prefer Tron as a separate coin than projects build in it, apart from USDT of course. For projects to build, I still think ETH and BSC are the best blockchains. In terms of fees, there is just no doubt that TRX is way better than the other two.