I like the BatteriesPlus X2Power AGM batteries so when the Group 65 flooded battery was failing I replaced it with this:
https://www.batteriesplus.com/battery/car-and-truck/ford/e=450-super-duty/2006/v10-6.8l-650cca/sli65agmdp5 year full replacement. When dry camping I like another AGM deep cycle source.
It was 10% off ordering online and picking up in store.
The Duracell AGM looks good too:
https://www.batteriesplus.com/battery/car-and-truck/ford/e=450-super-duty/2006/v10-6.8l-650cca/sli65agm