The best investment in Bitcoin is to buy Bitcoin and hold it in your non custodial wallet, because you will have full control of your Bitcoin and you will not have to worry that when the exchange has a problem the Bitcoin you have will be lost. Because whatever credible institution you say it is, they are still a company, and at any time they can get into trouble, and when that happens the Bitcoin you hold could potentially be lost. But this is your choice, if you feel that you believe that they are a trusted institution, just do it buy their ETF shares, only at your own risk.