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I have two primary shelters, a North Face Rock 22, two-man tent, and a Mountain Laurel Designs "Duomid" pyramid tarp.
The Rock 22 is what I use for car camping, and it's main feature that I'm interested in is that it was cheap, and I can pitch it on top of broken glass and no fucks are given. It has held up for about 10 years now, although I'll be replacing it before next year because the rainfly has reached its limit (my fault for storing it when wet one time last year, and mildew screwing up the waterproofing).
The Duomid is what I use when backpacking, and it's super light, provides to-the-ground rain coverage, while still being able to be pitched higher for good ventilation, and has a lot of room inside for me to sit up, move around, keep my gear dry, etc.
I've been eyeing the Big Agnes Fly Creek 2 as a possible backpacking tent, but I'll probably stick with my tarp for one reason: you can look outside at your campsite without unzipping anything. This is important when there is an animal in camp, and you want to covertly check out what kind of animal it is without alerting it to your presence. Not that it's an issue of safety, really. I just feel disconnected from nature when I'm zipped inside a windowless, cocoon-like, double-wall tent.
Pic related is my trusty Rock 22 when it was younger and healthier.