I was surprised that anyone topped Navy Federal Credit Union.
The answer is that nobody did - JD Power did score NFCU (giving them 866, beating Apple Card's 864), but then said that NFCU is excluded from the ranking because they "didn't meet the study award criteria".
If you can get an NFCU account, absolutely get one. Anyone in any US armed service can sign up to have an NFCU account, and anyone who is a member can invite anyone they cohabitate with to be a member (being related isn't required - all that's needed is a shared address. Roommates are fine.)
So, IE, my dad was in the navy so he was a member, as a child I lived with him so I became a member, and then my roommate and my wife both became members via me. So despite the name saying Navy, a lot more people than just people in the Navy end up being members.