Can't go wrong holding any crypto with decent volume for the next bull run but I think holding ethereum is a much better move from current prices.
Longer list with all top pure PoW coins. Their forks are identical so i excluded those.
Gold 1.5-1.8%
Monero 3.666%
Bitcoin 3.668%
Litecoin 4.16%
Doge 4.34%
ZCash 35.83%
Grin 158.63%
and similar was with value of coins that gets mined daily.
Doge 14.4m = $37.7k
Monero 1725 = $130k
Grin 86400 = 185k
ZCash 7200 = $334k
Litecoin 7200 = $496k
Bitcoin 1800 = $19.16m
Wondering why you didn't mention Eth? Its still all pow since pos hasn't been released yet.
I skipped all coins that were not fully mined. Most of ETH coins was created in ICO. 72 millions ETH was just printed and sold for tiny bit of BTC. That is 2/3 and that makes ETH a security and organizers will have to answer the law.