I'm more of a GM guy. Most of my friends are Ford guys. Other than my 06 6.0 Ford that was nothing but problems. And my buddies 01 7.3 Ford where he blew a tranny (his fault). My GMs and their Fords have been reliable. Problem is such a small sample. I think GM is over their little issues on the new 2020 (mine is a July build so every warranty issue that exists I've had, but I knew that going in). Ford just started production on 2020s so I personally would give them 6 months to iron out those kinks.
Other than that, they all the are as reliable as HD pickups can be nowdays. Maybe consider which brand of your local dealer has the best service department.