It would really depend on where you will buy the "bitcoin" from but you need to remember that you do not actually own the bitcoin you will buy but instead just a representative or a reflection of the real bitcoin. The "bitcoin" you will buy is regulated by an authority and therefore you do not actually have full access nor control over it which is to me not safe since I would want to be the one to hold my actual bitcoin.
Each market has some differences due to real time tracking errors. It is possible that the price in one market appears a few dollars short or vice versa. But with stock exchanges there is usually the broker fee you have to consider. I am pretty sure it differs per each one so you are going to need to choose the best one.

May I ask why buy in stock exchange though??? Why not just buy in a crypto exchange if you really want a centralized authority holding your coin

It's not Bitcoin, it's just an ETP. You need to differentiate between Bitcoin and ETP. Personally, I wouldn't buy an ETP like that, because you'll only get shares that represent the price of Bitcoin. It's much better to buy Bitcoin and keep it in your wallet - you can control it completely and sell it whenever you want. Always remember "Not your keys, not your coin"

buying shares is not buying bitcoin. its investing in corporations shares where the corp assesses collateral of a trust the corporation holds (as a secondary entity's valuation)
meaning the shares have no actual ownership rights nor voting rights over the btc, as the btc is held in a secondary entity(trust)
not the share holders claim of the main corp

the advantage people would get from this is not bitcoin ownership, but being able to buy shares that are exposed to a peg rate of the bitcoin market price, where they get to buy these pegged rate shares at a tax efficient method if done right via pre-tax deposit from their salary(employee pension plans, etc)

some people can set up their own self invested pension plans(sipps) and ISA's to then invest tax efficiently, which also when they finally withdraw when meeting the investment plans terms can avoid cap gains tax when withdrawing

Well, the country I come from, there are no much restrictions on bitcoin. I mean anyone can just buy and hold bitcoin even without paying taxes. But I don't know the applicability in other countries why people will see bitcoin and how easy it is to buy and hold and decide to buy something else that claims to be bitcoin, looks like bitcoin or is pegged to bitcoin. We make efforts to buy bitcoin indirectly only when there's a serious hindrance in buying first hand yourself.
Could it be that people do not actually want to take responsibility and be there own banks. They just want another person to be incharge and manage their investment.

There's no advantageous reason for me to buy BTC ETF where BTC is treated like Jpeg and nothing will change that.

It depends on what you mean by safe. The whole investment is controlled by the institutional investors, and the tax aspect of it is always taken care of.

You're buying the company BTC jpeg instead of the real Bitcoin.

The charge commission is based on the institution and the government policy.

Both now and in the future. This investment purchase don't make you a real BTC owner, or holder.

okay that makes sense but what is it that doesn’t work with exchanges that works for him in stock exchanges? maybe op is just not using the right platforms even as a beginner i quickly learned about exchanges and never encountered any issues so maybe it’s just the specific platform

Yes, you heard right; only professionals are allowed to buy BTC ETP on LES, according to the UK Financial Conduct Authority. The main aim is to protect beginners or less experienced individuals from potential risks, which is why they allow only professional retailers. Here is the link

The OP is getting into the professional lineup, which I think is not suitable for him right now. Firstly, you cannot hold the actual Bitcoin, and secondly, there are higher fees and commissions from brokers, which cause high costs. Instead, he can buy it directly from exchanges and own it in a wallet. Moreover, the price is actual, and he doesn't have to pay any commissions or fees.

They can say that they are good, safe and careful in management of their company treasury and customer fund as well as don't misuse customer funds without agreement of users.

But only God can know what they are actually doing. FTX and Sam Bankman-Fried said everything were good, Terra and Do Kwon told the same, but both FTX and Terra collapsed very quickly.

Trust Bitcoin Spot ETFs if people distrust accuracy and importance of "It is not your private keys, it is not your bitcoin!"

The concept of buying bitcoins off the network by literally buying some other asset or token that gets pegged to it isn't something I fancy. Whether stocks or pegged and wrapped tokens, I really don't think they are worth it. Yes from the context of your post op you seem very much interested in capital gains and ROI but in my opinion the fiat increase you get when you buy some bitcoins and price pumps actually cuts it already.

Aside from all these , you put your coins on a 50 50 risk because you actually don't own those coins fully since you don't have a direct control like a seed phrase or private key to spend them at any instant. To put it into perspective you have to first claim ownership of those coins via some verification on what ever platform that anchors it before you could spend.