If you can best is both. Stacking cardano and mining ETH or something else. With price going up probably for most alt you cant be wrong at the moment.
People are thinking mining ethereum is still worthy but do you see that the block reward of ethereum? it gives small amount for the small miners.
I have a friend that is still mining ethereum and he was able getting small amount of ethereum while he can get very good amount of ethereum in the past. POS is the best choice at this moment consider that doesn't need so many thins. it's also easy to get the passive income.