Just leave in in normal. Most winter driving is packed white snow, wet/dry very cold pavement or <6 inches of dry powder, wet heavy or other types. Normal almost always is better. I would save snow mode for slow crawling (say a driveway that hasn't been plowed), novice winter drivers (and I include those without winter tires here), or "maybe" a steep grade you've had to stop at the valley in because other drivers with all seasons can't get up. We had a great snow driving winter here last winter and I used mud/sand a few times to let the back loose, or normal. I put on snow once to experiment - from what I can tell it's for plodding along slowly when normal got you stuck. This truck is a traction monster.
There's once trail/driveway situation I have yet to experiment with and that's 6-18 inches of soft under a thick ice crust over top. IMO thats one of the toughest driving conditions, and that's where I would probably try normal>snow> reverse the hell out of there.