Originally Posted By: MrHorspwer
Pigeonholing all AWD systems into a single comparison isn't very fair. They run that range from simple systems that are FWD until slip all the way to super sophisticated system with electronic differentials.
Same thing with 4WD. You've got manual shift systems, auto 4WD, full-time 4WD (that may or may not function very similar to some AWD systems). Lots of variance.
I think GMBoy hit it right though, AWD is great because a good system is already there, sorting out traction *before* you know you need it. This comes at the expense of true off-road capability. If you're commuting and seeing traction conditions typical of northern snow on paved roads, AWD is the better choice. If you venture into slippery conditions on unprepared roads or off-road, 4WD is for you.
That said, I think one of the best attainable systems (not Land Rover, Porsche, or Audi) is the Quadra Drive II system Jeep puts on the Grand Cherokee. An always-on system with electronic diffs in the center and rear (earlier ones had a front e-diff too), plus a good traction/stability control system, plus low range, plus an available air suspension, plus a good size tire. As far as a system that will handle be capable in nearly any situation, it doesn't get much better.
Hey, thanks for the compliment and furthermore....I agree with all you said. x2 on the Jeep quadradrive systems! They are fantastic.