Sorry but this is something I really don't know much about. I will say that Kraken seems very legit, as do Gemini and Coinbase. Coinbase gets picked on a lot but my view is that it's because they're the biggest in the US and you've got to pick on someone. Kind if interesting to me is Bisq-2 which just came out. It's peer to peer trading, nit completely sure how it works, but I think it's definitely interesting.
Discussion
Ok, thanks for the reply. I have stayed away from Coinbase bc their fees are so high. I think Coinbase and Circle also get a bad rap bc they're kinda cosy with the US regulators. I know that sounds odd given that the SEC is suing Coinbase. Nevertheless, Coinbase does a lot of lobbying at the Federal level, which is probably a smart move for the company; but I can see how it may not jive with the philosophy of a lot of crypto hodlers..