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Well, I can see it being a personal preference. I rent a bunch of different SUVs when I travel so I have some experience with most of the different companies' alternatives. Some of them have rotary knobs / scroll wheels, some don't.

I prefer using the knob to touching the screen. It's much faster, primarily. You have some touch feedback so you don't really need to be looking at the screen for very long. You don't need to move your torso, so you can manipulate the wheel while you're driving normally with your left hand.

I can see it depending on what you're doing with the system. Personally I'm either using Spotify or Google Maps, both of which work quite nicely with the scroll wheel.