Just purchased a 2020 Thor XG 32 Omni, and really like it. That F 550 chassis and 6.7L diesel engine is awesome. This is our 2nd Thor the previous one was a 2016 31L on the E 450 chassis, we really liked it and had no issues with it, there were a few small things just took care of them myself. But the difference in driving and handling between the 2 is night and day, the F550 is hands down better and much quieter since you don't have that V10 sitting next you.
Have not found any issues with the new one after 3200 miles and several nights in it and we are leaving in a week for the mountains of western Wyoming for some dry camping.
This is our 3rd motor home and have been fortunate with no issues. They all will have some minor problems seems as though some come out of the factory with bigger issues.
Pick the one you like and go camping.