I've never used a Big Sky product, since they were having delivery difficulties around the time I was in the market for a shelter. But I've heard good things, so if you have deep pockets are really want freestanding it may be the way to go.
But "free-standing" is a con! It's a marketing gimmick. Or, at best, a "feature" aimed at the inexperienced and gullible. There is a technical term for a free-standing tent in a high wind: "box kite." Thus it will head for the horizon if not staked down, so it will need stakes anyway. A non-free-standing tent merely collapses if a critical stake fails, and flutters around on the ground a bit or gets caught in the nearest bush, but generally won't set off for Nebraska in the way that a kite-tent will. (But I did once run into a guy here on BPL who insisted that he hikes on featureless rock plains. I'm not sure where he finds those...)
I HAVE owned one of the older 1.5-walled Moments, and liked it a lot, though I eventually went 'mid in a fit of simplification. It's not freestanding (except "sort of" with the optional longitudinal pole) but everyone who insists upon a freestanding tent is sort of having an error-in-concept, anyway.
So, I will say this:
For a non-tarp the Moment is conceptually about the simplest tent I've ever used, and ABSOLUTELY the quickest to erect. It only uses two stakes (minimum), so you just stake one end, insert the pole, then tension and stake the other end. Poof- erected. It's never taken me more than 90 seconds, and not infrequently less than 60. Finding stake-out points in precisely the correct spots can be challenging for a dome tent or even a 'mid on some ground, but where are you never going to find TWO? For that matter you would only rarely even need stakes at all, since you could bring slightly longer lines and reasonably expect to always find a couple of trees, bushes, or rocks to tie off to.
In any conditions where the Moment would need more than two stakes, ANY other tent would need extra guys, too, including an ostensibly "free standing" one.