Sounds like you have yourself a very nice ride indeed.
Might be hard to predict how this winter will turn out in your neck of the woods, might be decent for you there, but then again you just don't know?
To, me, it sounds like your car is in pretty respectable shape, no doubt nicely maintained, and is fairly new. And I'm sure your most important criteria is keeping it looking that way though yet another winter.
I keyed in on one highlight sentence in this last post of yours, "Looking for something to get me through winter". To me that means you're likely looking for a very durable product, one that may not necessarily be a beauty product such as WG Fuzion, WG Deep Gloss Paint Sealant 3.0, Pinnacle Souveran, or such other beauty-estate products, but that good protection might be paramount for this short duration of lesser than ideal weather conditions for you.
In my eyes, a high level of protection during this time is paramount, not so much looks, or cleaning abilities as top considerations.
Thus again, I'd be likely looking towards a Collinite product, or as others like for high durability, Sonax Polymer Net Shield.
As for Meguiars products, yes, they make many good products, but IMO, many are more designed for the show car circuit, I've seen a lot of Megs stuff be non-existent and fall short on paint after just a few washes, then gone.
Products such as Menzerna Powerlock Sealant, I've used it, it is good, seems very similar to WGDGPS 3.0, likely a similar formula and made in the very same plant. But I don't think neither can hold a candle to Collinite #845 or #476 for durability.
#845 should give you a good 3-4 months. #476 should give you a good 5-6 months, perhaps even longer. BTW,#476 is a Paste Hybrid.