You have a point ethereum prove that it still the top 2 altcoin in crypto world so must better to hold your 1ethereum dont split it because theres a high chance that you miss a opportunity to earn a good profit yes theres a lot of good altcoin but ethereum have a high chance to grow more than tge altcoin you chooce to buy.
Thats only my suggestion and prediction about ethereum it is up to you if you hold it or split into two.