Bitcoin is better

I'm in agreement. The supply is known, limited, and soon to be halving in production of new coins. Miners will lose 50% of profit. That will have many impacts, no?
As of now, I'm trying to weigh if what is better and I think the gold is better than bitcoin, after bitcoin reaches it maximum supply.
Or in short, if bitcoin reaches 21 million, there will become a stable price, I guess.