Ethereum is the king of altcoins so it should be the best compared to other altcoins. I also as a holder ethereum is very optimistic about
ethereum's future in 2020. Even though ethereum's price is still at $ 248 it doesn't close may be able to go up to the price of $ 1000 in 2020.
Then if you talk ethereum for the next 5 years it must be getting more expensive ethereum prices, I predict the possibility of ethereum prices
will touch $ 5,000 in the next 5 years.
The problem is ETH supply is not limited. You can keep minting. There should be limit to to all number of ETH supply.
Overall crypto is still in bear phase. It's more than 26 months now.