maybe ETH its as u get more amount for long term invesment rather then losing those on altcoins
remember that ETH is also an Altcoins so you are calling Ethereum when you called losing in those altcoins.
If I had 500 dollars to invest then better to move it into 5 different coins to make more chances in earning when the market
change route because we know when there are bull market there are other altcoins that make more profit than others.