I am in the process of ordering a 2021 Ram 2500 6.4 litre, automatic, crew cab, 4x4. Trying to decide 3.73 gears or 4.10 gears? How do they tow?

I have been towing a 26' Haulmark trailer with my Dartsport, since 2004 . In 2004 and 2005, I towed with a 1997 Dodge Ram 1500 4x4, with 5.2 litre. Struggled, but got the job done. Trailer loaded weighs 9750 pounds. I have been towing since 2006, with a 2006 Dodge Ram 2500 Slt, diesel, automatic. The Diesel is the 1st new vehicle I ever bought. Tows great. Bought a 2008 Class A motorhome with a V10 Ford, in november of 2017. That tows the trailer great also.

The 2006 Diesel only has 52,750 miles, always garage kept. Very good shape, No rust. Never any problems. Thinking about selling and getting a 2021 Ram 2500 hemi. I know the newer hemi will get better gas mileage. Just wondering how it tows. Won't be towing with it much. If I am going to the races, it will be with the motorhome.

Which gear ratio should I get?? 3.73 or 4.10 ?? Thanks for any info, or opinions.