I agree. I assume you are talking all three are duallys. If high speed is important, loaded or empty, get the 3.73, if maximum towing at slower speeds is important, get the 4.10. Leave the 3.42 for the SRW trucks or the 6spd manual dually. The 3.42 is fine (SRW) for those trucks because that is all that is available, kinda like the Model T back in the day. You could get any color as long as it was black. If the 3.73 were the only gear available in the SRW it would make one fine tow hauler, especially if a little bigger tire is needed/wanted. A bigger tire on a 3.42 is not a good idea.
Nick