Given your location and price difference you just stated, looks like SP would be an excellent choice. An overlooked advantage is the proximity to their facility incase you need any warranty or upgradability work.
GFC is down the street from me, another factor that swayed me, besides the $7,500 price difference for the options I selected. Truma is real nice & convenient. literally 20x more expensive than a decent diesel heater though. I couldn’t justify spending an extra $3,000 over the diesel heater for mostly convenience. Heck, I even use my cheap buddy heater in certain scenarios. People complain about condensation, but this can be easily mitigated by slightly cracking a window or two. Not ideal, but still $3,000 cheaper. If I was living out of my rig full time or a ski bum, I’d probably splurge on the Thurma.
It’s a big purchase, and I went down this research rabbit hole as well. Check out
Meet the Tune M1: an ultralight, durable pop-up truck camper with class-leading space, modular design, and 360° access—built for overlanding and backcountry travel.
www.tuneoutdoor.com
Just came out. Know of a few people who switched over from SP & GFC and are very pleased with the additional living space that is lost with a wedge style camper. Practically same opening/closing time as SP/GFC.
The Hiatus Camper® is our take on the ultimate adventure rig. Lightweight, streamlined, and rugged enough to handle any terrain.
hiatuscampers.com
Hard insulated walls and set up time less than 30 seconds.. I’ve heard some excellent reviews.. Expensive though.
I’m sure you’ll be ecstatic with what ever you purchase. Good luck!
PS - Make sure you get it insured! Also, join the SP Facebook group if you haven’t. A lot of good information and people list their slightly used campers on there all the time.