I have tried both. We often drive on snow or ice here (basically every day for the last 2 months), so I have had a lot of time to compare.I'll give it a shot. I think I read off road mode disables tracking control though. If so, have you tried both, and which one works better? Having basically 4x4 without traction control, or mostly RWD with traction control?
There's no question in my mind that Off-Road Mode is more stable and solid for us in deep snow, ice, and rutted snow despite traction control being turned off. We play with it, switch back and forth during drives, just to see. Both my wife and I (we are lifelong winter drivers) feel the difference instantly. Can we drive OK without it? Yes, but neither of us like the kick-out of the rear wheel drive in ruts or slush or on turns. Who wants their back end in the wrong lane even for a second? If you've ever driven a rear-wheel-drive pickup on ice you know how bad that can go and how bad it feels (our other car is a pickup).
Anyway, I suggest you try it and see how you like it.
For sure you will take a range hit driving in ORM. We don't mind because we have inexpensive power and charge at home. If I were on a trip and worried about range I might not use ORM and just slow down more.