I feel like stock markets are stable, but also very slow. On the other hand, cryptocurrencies can go on a bull run, where coins go up 30, 40 times in value over a period over a couple of months. Cryptocurrencies are more volatile, where you can see 50% drops daily, but the market usually springs back very quickly. But as the saying goes, no risk, no reward, which is why i hold mostly crypto and only a few stocks.