I live on top of a hill and have run snow tires on several 4WD and AWD vehicles. My last three sets of snows were all Blizzaks — one thing to remember with Blizzaks is that at about 6/32 they’re more like an all-season tire than a snow tire. That’s why they have two sets of wear bars … when you hit the first set, the tire will still pass inspection but its snow effectiveness is diminished.
According to Bridgestone this is pretty much the case with all snow tires. I don’t know if that’s true or if it’s a savvy marketing ploy.
On my last two SUVs (Honda Pilot and Acura MDX), I ran my snow tires on wheels one inch smaller than my all-seasons. The rationale for this is that the snow tires are slightly narrower than the summer tires, which is what you want in the winter.
The Telluride is a bit different in that the OE 18” size has exactly the same width (245mm) as the OE 20” size. If you want a slightly narrower snow tire, you could go with a 235/65-18, which would be just a bit taller overall and would induce fairly minimal speedometer error.
I had planned on going the same route as PittPa and picking up a set of OE 18” wheels but couldn’t resist a very nice set of OE 20” wheels being sold by a forum member. I had also planned on Blizzaks but ran across a stupidly good price on Goodyear Ultra Grip Ice WRTs in 245/50-20 (the OE 20” size). My wife had these on an Infiniti G37x and they were good enough for several trips to, from, and around Buffalo in the dead of winter. IMO not as good as the Blizzak but probably 85 - 90% of Blizzak performance at ~50% of the cost. I’m retired, so if it gets really bad I just stay home