E-Torque won't help you with towing. Maybe a tiny bit with MPG, but thats it; EcoDiesel will help with towing MPG, and MPG in general, but it won't get up and move like the Hemi does. And when towing, the Hemi really likes to drink the gas. Not quite as bad as the EcoBoosts, in my experience, but definitely thirsty.
For long-distance towing, the EcoDiesel will probably be better.
If you want get-up-and-go with occasional towing, the Hemi will probably be better.
That is a drastically cut down nutshell, and obviously my opinion. If you do a search here and on other forums, you'll find many threads where the "Hemi vs EcoD" topic is explored and beaten to death. The E-Torque is meant to help with MPG a bit, it will not help with towing/power.