If you are talking about trading the volatility with derivatives (long/short), that's usually the most profitable move, than obviously crypto. If you're talking about trading the asset directly, presumably only long positions, then it would be the market that is the most bullish. Currently, neither are looking bullish, so in my mind it would be which is less risky. Thus; stocks. Crypto market right now is for shorting or long term investing in my opinion, not trading long.