Bitcoin may outperform the gold market in the distant future but right now Bitcoin cannot outperform the $17+ trillion gold market. One of the main reasons why Bitcoin cannot easily outperform the gold market is acceptance, especially gold acceptance everywhere in the world, but Bitcoin acceptance is negative in most countries of the world. When Bitcoin gains acceptance in all countries of the world, Bitcoin will surely outperform the gold market easily.

You've got a new account, I'm curious why you even signed up.  You come off as not really caring about bitcoin, but of course I could be wrong and was just curious.

I take it that your question initially was asking if we thin bitcoins total market cap can surpass the total market cap of gold.  But then you seem to shift as in which ones a better one to havehold.

What I do know is that these are two totally different things with different uses, though their uses or "use case" do seem to overlap a bit at times.

I disagree with some that you said TBH.
1. It's certain that Bitcoin will reach $200,000 or higher in the future. In the world of crypto, there's no such thing as "CERTAIN" and we all are living in probabilities. What is your evidence that Bitcoin will reach that price in the future? You're just predicting, right? I know I'm bullish about the future of Bitcoin, but I'm leaning towards the fact that there's still a chance that it might not happen.
2. Holding Bitcoin in the next couple of years might be or might not be profitable if you're investing. Yes, holding Bitcoin is one that I recommend as well to others, but please say to them that, it isn't guaranteed that you will make profit by investing on it.

Gold is stable because it has a higher market cap compared to Bitcoin which has a lower market cap. I still remember back in 2017-2018 when the market cap of Bitcoin is very low (at around billions at that time), and it can be manipulated very easily. Now, it's harder for that to do with Bitcoin, but I'm not saying that it's impossible.

As somebody that didn't even see a true Gold, I would always go with the digital gold since that's the one that I have access with, and for sure, most here will say the same. One of my dreams though is to have a true gold to hold, but nobody's selling it within our area.

one word: "yes"

The price of gold is higher than ever but the way bitcoin is increasing in value and demand, it is expected that bitcoin will outperform gold in the past few years. Bitcoin is considered a valuable asset and if one can invest in bitcoin now there is a possibility of getting huge returns in the near future. A lot of profit is possible in a short period of time but the price of gold tends to rise slowly. Bitcoin is becoming a great means of investment for everyone in terms of future security and savings. In most cases bitcoin is considered a long-term investment option the issue of return is also assured.

In my opinion Gold is more stable than bitcoin so bitcoin can`t be that stable so people can hold it in larger quantities or amounts. You can posses gold with you but you can`t posses bitcoin physically so for me GOLD will the world for next 1000 years.

Gold has a much larger market cap, hence it doesn't react in such a volatile way when new money flows in/out of it. If Bitcoin had the same market cap, its price would also be more stable.

Physical possession isn't such an advantage as you think. First of all, you have to store it somewhere. Most probably in a safe or a bank. That costs money. You can also keep it at your home under your mattress, but who does that? Secondly, it's not divisible. How are you going to pay something worth 1/5 of the gold bullion/coin you have? With bitcoin, that's not a problem. Thirdly, good luck trying to cross a border with it. Want to transport it somewhere else? Enjoy the transportation costs.

With digital money, you don't care about any of that.

Bitcoin has potential to take over the first position of gold, but it is still very new so it looks to be dangerous with many traditional investors, the elderly, the middle aged, and institutional investors.

Institutional investors have begun to change their stance on Bitcoin and they are bringing more capital to this market. Microstrategy, Black Rock, many ETFs, many big companies have been participating in this market, and the numbers are growing fastly.

With more demand, more new capital in, price will rise because supply is increasing slower than demand growth as consequence of Bitcoin halvings so far.

How is the 21M Bitcoin cap was defined and enforced

Volatility is what makes BTC - BTC.
And its cap is becoming bigger with each cycle that comes by - it's already much harder to move the price of BTC: and it slowly will become harder and harder for institutions too, in my opinion.