Should I get 2WD/FWD or 4WD/AWD?

I'm looking to buy an SUV/Crossover (mainly GMC Acadia/Buick Enclave) but mostly available are 2WD/FWD versions opposed to the AWD/4WD. I live in Wisconsin where the winters can be anything but a wonderland & I'm NOT looking to be the guy stuck in the snow because I'm stuck with 2WD. Dealers often say, "Well, it's got traction control so it's pretty much the same thing." I often say, "Then why'd the even bother making an AWD version?" Is there a substantial difference where the AWD DOES matter or not enough to fork out the extra cash??