Tungsten Ultralight 2-Person Tent
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I'm on the same search myself! We likely have gone down the same rabbit holes. I did notice that the Sea to Summit tents had less interior space than the others you mentioned. I also am interested in the UL-ish tents from Mountain Hardwear and Marmot. I had an old Marmot Tungsten UL 2p that was bombproof!
I've got the 2 person Marmot Tungsten UL and so far been very happy with them (I have 3... bunch of kids). Haven't yet had a good rainstorm, but light rain, so haven't tested it in truly nasty conditions. They make a 3 person also. Without weighing, it looks like it's just a tad heavier than the Copper Spur UL. I bought some cheap and light footprints for an extra layer, but worth the weight penalty given how rocky everywhere I go is.
I was curious about the tent. It's very similar to the Marmot Tungsten UL 2 person that I have and like. It's like 3.5 pounds. So, another option for OP that's like the Aspect 2. [https://kencooutfitters.com/products/marmot-tungsten-ultralight-2-person-tent](https://kencooutfitters.com/products/marmot-tungsten-ultralight-2-person-tent)
Sundome is much lower quality than the other options. If you're looking at Coleman, step up to at least the Skydome. Funny enough I was going to recommend the Basecamp. Ventilation isn't great with the fly on but that's very common with cheap tents. I like wooded campsites anyway where you can angle the mesh portions of the tent into the trees and keep the non-mesh facing the walkway for privacy. Kelty kinda owns the cheap-but-mostly-quality space. The Discovery Trail 3P is very meshy which helps with ventilation but still a lack of fly vents. If you can stretch the budget or find a good sale, the Kelty Rumpus 4 is a killer deal. Lots of ventilation, vented fly, and a great vestibule that you can keep wide open to help with ventilation. The Teton looks fine. I like the look of the higher denier fabric and vented fly. Teton has historically been a cheap crap brand but they've really made some improvements in the last few years. I don't love that their "lifetime warranty" explicitly mentions that things like bent poles are considered normal wear. The marmot is an excellent option if you can get it at a good price and you're genuinely okay with a 2p.
Go lightweight over anything else. You do not need a super heavy duty tent for a long distance multi day backpacking trip. The only reason you should be sacrificing weight should be for weather. I use the Marmot tungsten (2person 3lbs) for all backpacking. It is not heavy duty but it is it going to be destroyed from repeated wear and tear in the backcountry. I go heavy if I am going mountaineering and need something for wind and snow.
I got my tungsten 2p from sunny sports recently because of the price. No issues here. Great little tent.
I’m on my second 2P, only bc first was replaced under warranty. There is very little lb difference between 1P and 2P, so unless you want to stay in a tight 1P, upsize to the 2P. It’s perfect for me and my pack, although it has 2 vestibules too.
My recommendation as a life scout having been in an active scout troop for 5 years is the Marmot tungsten 2p. It has plenty of room, is easy to set up, and is nearly bullet proof. I have had the 3p version for 4 years with no issues. The tent can be used 4-seasons out of the year, and is light enough to take on backpacking trips. You shouldn’t have to buy your scout another tent in his duration in scouting(provided they take proper care of it)
I really like my Marmot Tungsten 2p. Super easy to set up, light, packable, and very spacious.
I like my Marmot Tungsten 2p
Of the 2 I would go with the Marmot personally