Can you guys give me the LOW DOWN between the GM/Chevy PU & Dodge

Seriously? Does my opinion really mean this little?

I am asking for more information. D100, D200, D300, W350, -things like how are the suspensions different between the sizes or between the two makes. I had a D300 Dually flatbed with a Dana 70 and it came with a slant 6. What is out there?

What wears out first?

What do I need to look for at the vehicle when I am checking out the truck?

I am not a truck guy due to lack of funding or time.
There are 3 different dodge truck rearends that I know of.
There never was 8 3/4 axles on the trucks I listed (as I know). Why?
Does Chevy put the 10 bolt main in their pickup trucks? For what? 305's? Or also 350's?

Is the D150 a light suspension package?
Rusty it would be unfair to ask you to explain all the options and all the problems of these two makes.
I am trying to make the best calculated purchase.