The most promising coin with still a low cap and big potential to grow is Tomochain. Technically Tomo is much better than other coins (Ethereum, NEO, Eos etc.) They have more highest TPS, near-zero transactions fees and EVM-compatible protocols. Looks like this should be another "Ethereum" in near future.
Personally I hear the first time about that currency. Also, if it has the power to make a difference, it will go forward. Otherwise, there are plenty of money can replace the ETH.