Instead of choosing one, it is very good to invest in both these coins in the market because the potential it has will always benefit us in the market. If you look for a short term you won't get much benefit from these two coins. It is always good to accumulate when their prices are low in the market and it will help you to make a decent profit if you manage your patients.
Instead of waiting for the lows to buy do it time based on regular intervals then you dont have to play the waiting game to buy.
correctly, if you are in the market and do regular trading, then in addition to bitcoin and ether, you need to take small altos on the bottoms and sell, when they grow up.