Everybody has he's or her own. the main issue of cryptocurrenqcies these days can be either stable for a long period of time, or they can stay highly volatile for a long period of time. Nowadays, cryptos are more stable than stocks, but I don't think it will be a very long-lasting trend, because all traders are familiar with cryptos. this comparison can be determined only by a thorough technical analysis or a fundamental one if we talk about long-term intentions.
I hope you do understand that when you say crypto that you're putting the whole market into the conversation and not just Bitcoin. There's no way cryptocurrency can be less volatile than the stock market. Have you seen the volatility that is happening with altcoins, projects are getting manipulated frequently and causing investors losses. For every price movement that Bitcoin takes, it after the altcoins market irrespective of the movement being up or down. The stock market is a regulated market but crypto isn't so there's no way you can tell me that the stock market will be more volatile than crypto.
Sometimes crypto price stays stable for some minutes but that happens to only Bitcoin as athe rest of the market is always having a difference in the price of their coins. Bitcoin too doesn't technically stay stable because there's always a slight difference in the price at each time you check the market but it isn't as volatile as it used to be. Bitcoin is a better investment than fiats and it isn't the volatility that makes investing in Bitcoin better but what Bitcoin stands for which is freedom from centralized organisation that stock is a part of.