In my view real estate remains a fundamentally good investment choice. I mean we will always need a place to rest our body. You can't say the same about bitcoin or gold.
I am least likely to invest in Gold from the three assets talked about in this thread. Its usecases are rather small and it is a precious metal that could be soon produced in laboratories or found in the outer space. I'm not willing to place a significant amount of my net worth in a metal just because it has proven itself to be a reliable hedge.
Millennials like an instant, practical and easy to pick (low hanging fruit) and easy to exit whenever they want. Gold and property businesses are considered outdated, even though they know the essence of business is profit. Although property investment is profitable but the process of getting a profit can take years. This is what makes property and gold investment unattractive to millennials.