on this topic it certainly becomes a big question for me when you ask about buying BTC or ETH.
I ask again, do you buy to invest or trade?
if you want to invest then I suggest buying BTC because the nature you are going to use is long term.
if for trading then both are also good, but I recommend buying ETH because the market is currently moving slowly and to get a profit with short-term trading can be seen immediately even though it is not too big.