Look, I'm not going to post any more about this because aside from wasting more time than its worth scouring archive.org for old websites, there's no way to show this. However, for years I watched early season openings like a hawk, and it is a rare, rare year that Loveland doesn't have the most terrain open. Some years A-bay beats them in opening by a day or so, but Loveland can consistently get more terrain open- they show on their trail map which runs have snowmaking infrastructure, and by the first week of December, they almost always have all of that open, no matter what happens with snow.
When I am referring to snowmaking infrastructure, I'm referring to those in the running to open first, which really means Abay.
Maybe I'm overstating things by saying the first week of December, but excluding 2010-2011 and other years where early season snow has been sufficient to open the entire mountain regardless of snowmaking (Loveland had chair 8 open pre thanksgiving in 2010), Loveland almost always wins the Thanksgiving game.
Another thing I think is in Loveland's favor is that they don't open runs until they have a rock-solid base- They will manage runs by opening them for a few hours for skier packing, then shut them up again to blow more snow, and repeat several times before officially opening a run for the season- I've never damaged a ski skiing there in the early WROD season. I'm not comparing this to Copper as I haven't skied there pre turkey day since 2007, but I know a lot of other places early season (WOLF) are ski at your own risk...
If the OP is going to ski pre thanksgiving in Colorado, I think the safe bet is Loveland. It muddies up a bit for the first week of December, by then everybody is open and conditions can be 100% in a good year, or 20% for a bad, and who is winning depends on whose microclimate was favored by the storms.