Newer GMC Sierra 1500 3.0 Diesel vs Newer Ford F-150 3.5 Eco boost

Hi (new to redit) looking for some opinions on the GMC Sierra 1500 with the 3.0 diesel vs the F-150 3.5 eco boost. Both would have the max towing option in crew cab form. We tow a camper 5-6 times a year that weight 6,700 lbs dry weight and is 35’ long. I also have a commute to work that is 30 miles one way. Not to mention longer trips for work that are around 850 in total miles round trip when needed. I will likely put anywhere from 10-12k miles on a year. Is it worth getting the diesel based on mpg or no? TIA