I mean for millionaires stocks surely a more attractive option, it has a slower phase though consistent market it can take a while if you have a small capital but if you are a big time investor you could consistently gain profit even the smallest movement in market gives you about a hundred to thousand. On the other hand crypto can be more profitable in short term and low capital investments, and that's what big investors are afraid of since you could gain big time or you lose more than you can handle.

Anyways I am sure with the right portfolio every investor can earn regardless of it being stocks or crypto, comfortability is what matters and if you're comfortable earning less but consistently stocks is for you but the problem is you can almost guarantee that you'll regret not investing in crypto as they pump like crazy and cryptos you like goes to moon. I've always seen some hype around crypto than stocks but both has advantages and disadvantages I would say.