Kraken is one of the most reputable exchanges we have right now, even more reputable than Coinbase in terms of public opinion. Paxful? It's a legitimate company and service, but not sure about reputation.

By the way, probably minimize the exchanges you're using and the KYC/AML documents you're submitting. The more exchanges or services in general that has access to your personal documents, the higher the chances of them getting leaked some time in the future.