With multiple options of fleets and seats, you’re relative seniority in DEN at UA would be a substantial benefit. Even if you decided you don’t want to fly WB and want to be on the Guppy, there are so many people senior to you that want to fly the Bus, 75 or 78 that they move out of your way on their own. Some people also choose to commute to WB LH which helps junior people move up in whatever seat they choose. This creates so many QOL options at a relatively short time on property.