In regards to risk, bitcoin is nothing more than pure gambling. Worse, bitcoin gamblers face odds that are worse than found at even the worst table games in Las Vegas. It is worth nothing.
Over the very long term, stocks have a positive return expectation. We expect the stock market to rise over time because earnings growth drives stock prices.
Earnings always grow over time because economies, particularly the United States economy, always grow over time (regardless of even lengthy recessions).
If you look at rolling 30 year periods of the Dow Jones, stocks have averaged an 6.7% increase. In the past ten years, the Dow Jones has delivered a 13.6% average annual return.