There are no doubts both vehicles you are considering will do the job. I am more familiar with the Ram.
2018 and older gas trucks will have a 6 speed transmission (66RFE chrysler) and a standard 3:73 axle ratio. There is an optional 4:10 axle ratio available. If your pulling heavy go with the 4:10 axle ratio.
2019 was an updated model. These have an 8 speed transmission (ZF 8HP).Also come in a standard 3:73 and optional 4:10 ratio. From what I hear the new transmission is working out very well.
One of my friends purchased a gas F250 recently with the 6.2 engine. This truck was an XLT if I recall but was only available with the Ford 6 speed transmission. It is a nice truck. He told me the higher trim levels get the 10 speed transmission.
Steve, Christy, Anna and Phoebe (Border Collie)
1994 Classic 30'11" Excella - rear twin
2009 Dodge 2500, 6 Speed Auto, CTD, Quad Cab, Short Bed
Hensley Arrow hitch with adjustable stinger
WBCCI # 3072