Honestly for me I can`t exactly determine to be next to ETH because as of now ETH is one of the most in demand cryptocurrency that people must be invest on it.
Yes, now ETH is still the most in demand coin compared to other coins whose success is still very little, although actually Polkadot is also a good coin, but to match ETH I think there is still a lot of work to be done by Polkadot.