I don't classified investments as supreme over the other, but rather I follow through based on the Risks involved and Capital needed.

While Cryptocurrency is a promising world likewise Real estate, it all bores down to the investors decision and risk the investor is ready to take aligning with a calculated returns over a long period of time on the Asset.

 
Both are great investment choices with Risks, I believe there is no such thing as "Supreme". A Real Estate investor might do well on his investment than a Crypto Investor, as another Crypto Investor might also have a higher return than a Real Estate investor. So the problem is not the supremacy of any Investment but;
 The choice, Decision, Risk assessment, Capital, and Readiness of the investor.