If your time horizon is long enough, volatility shouldn't matter. Historically speaking Bitcoin is getting less volatile with every market cycle. I would not be surprised if in the future its volatility is comparable to the S&P500.
Why would any sane person invest in real estate? You have maintenance costs, property taxes, it's not liquid and you can go years with little growth. Not to mention if your area see's hard economic times (i.e. Detroit), the chance of a rebound is slim.