It seems to me that Ethereum does not have competitors yet. Although, on the other hand .. these competitors can appear very quickly. Just now it's my choice for investing.
Well, there's plenty of competitors to be true, there are many decent blockchains out, like NEO, which is paying GAS. ETH does not pay you anything for the hodl.
However, still the Ethereum project have the best team out there, it is the 2nd crypto on the market and there are hundreds of projects on ERC20.
And only now it keeps the etherium afloat. If in the near future the price falls even lower, the miners will stop mining blocks, because this will be unprofitable. The etherium has problems with the speed of transactions, and if these problems do not resolve in the near future, the etherium may lose its place in the top.