I do not know about the next monster to be honest rather i would say that i have high hopes about potentially big price of ADA (Cardano) in the future, i am also not into risking it all or want to spread fomo about a new coin so my second pick would be Eth because i know it will boom.
Yes, in recent days between the ADA (Cardano) and ETH coins have both started to rise in price, so obviously now is a very good moment for someone to have both coins in order to get a lot of profits in the future.