If you are buying Bitcoin based on the logic of 'like gold', what you are purchasing is 'digital scarcity' and 'hedging against fiat currency depreciation'

As long as you do not believe that fiat currency will retain its value forever, you need to look for an asset that cannot be easily inflated. In this dimension, Bitcoin is a more portable, more easily divisible, and more easily verifiable form of gold.

Besides being able to hedge against inflation, the market capitalization size is an important factor that determines the difference in price increase compared to gold.