I prefer on bitcoin because it has a higher value that Ethereum in which you can easily have much money.
the "money" you can get is the last thing that matters when you are comparing two things.
in fact "money" you can get can potentially be a lot bigger and much faster in ETH because it is a pump and dump altcoin. for example you invest before one of its pumps and you can gain a lot of profit in a couple of days that the pump is going on. but after that nothing will happen and price will get dumped.