I think it is not necessary to choose one single coin. It is necessary to distribute investments between several coins, but also you have to monitor the movement of the market and adjust your investments. At the moment, ETH shows good growth.
yes, both are very good coins, and may have the same potential. when you're confused, then choosing both will be better than one of them. however, if you want to focus on one, I might suggest holding ETH. we know that the potential price of ETH can rise above the price of $ 350.