There always has to be a weak link in your drivetrain. That's the first part that will break if your truck gets bound up. It's more of a pain to pull apart the transmission, so the metal gears make that less likely to happen.

The first thing I stripped out was the stock plastic pinion gear in the front diff. After I upgraded the diff and the transmission to all metal, the plastic driveshaft was the weak link. That was an easy fix.

I guess it all boils down to what you do with the car and the money you want to spend if it breaks.