Hybrid vehicles in general are much quieter than regular cars. So in that theory, yes, hybrid trucks would be quieter, and take less gas to run as well.
the advantage diesel pickup trucks have is that they have been around for a while, the technology has been proven, and they are cheaper. The disadvantage is the gas mileage. Compare and decide for...
A hybrid truck will run on electricity generated by the braking system. It will also run on gasoline when needed, just like a regular truck. Hence better gas mileage.
This is a loaded question because so much is option. I have had both and the current one is a Ford. If I could burn this piece of junk to the ground collect the insurance and not go to jail I would....
Hybrid trucks are trucks that produce less carbon emissions than a regular truck would, it may not run only off' petrol but in some cases even off gas or battery.