
The North Face
Wawona 6
Spacious vestibule, strong in storms, but rainfly tricky solo.
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I have the Nammatj 3T. It’s great
My 3 person Hilleberg Nammatj is still roomy with two people and gear. But then again I don't drag my entire living room out with me to go "camping" and am of the belief that you can enjoy the outdoors without dragging a circus tent out there.
For one person, I think the Hilleberg Akto is the best tent ever made. I would say the Soulo, but I think the Akto is 90% as good but 30% lighter. Just my own opinion, of course, they are all excellent tents. I also have a Nammatj which I love for 2 persons.
What you've described is a Hilleberg. I don't think any other tent beats a Hilleberg in terms of strength to weight. I went with the Nammatj over the Nallo, mainly because I prefer the ventilation on the Nammatj and I prefer the door placement, but it is heavier than the Nallo. You won't be disappointed with the Nallo, or any Hilleberg for that matter, they are awesome.
Multiple tents is the only sensible option but honestly if it had to be one tent I think the Hilleberg Nammatj is up there. It has really big vents both front and back and full mesh convertible door. You could probably makeshift something to lift the outer fly off of the ground for the hottest months.
It'll probably hold up just fine in typical 3 season weather. But looking at the fading dye, it's seen a lot of use. Even with good care, it's a sign that the nylon may not be as strong as it once was, so I personally wouldn't trust it in harder winds. Especially when weather can be variable in the wild. Personally, if I was looking to get a nammatj, it's for its 4 season capacity, and knowing that i can trust it to stand up to unexpected changes in weather. Indeed, that's exactly what happened a few weeks ago. Set up with expected mild weather, ended up with 50mph gusts all night. Noisy, but felt safe throughout. This is especially in light of reasonably capable tents within that 600euro price range.
Any good 4-season tent will have no issue holding up to strong winds on exposed beaches. I recommend a sealed 4-season model not just for the stronger poles, but because it will keep blowing sand out of the tent, which can become a huge issue in big storms. I once endured a 20hr, 80km/h+ wind storm on the Nahanni River in my 3 season Mountain Hardwear Aspect 2 tent, and while the poles miraculously didn’t break, the entire inside of my tent was full of sand when it finally let up. Like, a quarter inch of sand everywhere, and I’d been breathing it all night. With every gust the tent would fold down onto my chest, and I’d get peppered with a fistful of sand at my face. It was probably one of the most intense, miserable nights I’ve ever had in the backcountry. Several of my friends had heavier 4 season tents and slept through most of the ordeal, and had zero sand in their tents. Something like a Mountain Hardwear Trango, Marmot Thor or Hilleberg style tunnel tent would be your best choice if you’re expecting serious wind. They’re not cheap, but they’ll take whatever you can throw at them.
While I don’t have experience with the specific tents you’re looking at, my advice would be to go with Hilleberg if price isn’t a differentiating factor. I’m sure either would work great for you - beautiful products from both companies. I have a Slingfun Portal and I absolutely love it, but Hilleberg design is in their own class. I’ve spent probably 40-50 nights in a friend’s Hilleberg, vs. maybe 30 in my newer Slingfin, and the small details of the Hilleberg win the day. Slingfin’s design is top notch and they have great attention to detail, but Hilleberg takes the same care, attention, and no holds barred approach to quality but you know that every detail has been refined through an order of magnitude more cycles of use and abuse in absurd conditions. All the cool details that sound like a great idea on paper but don’t fully pan out in the real world have been weeded out by Hilleberg leaving an absurdly refined design. A hardware product developer by trade, I can only aspire to that level of design quality.

The North Face
Wawona 6
Spacious vestibule, strong in storms, but rainfly tricky solo.

Gazelle Tents
T4 Hub Tent Series
Fastest setup, durable, but bulky and awkward door.

Durston
X-Mid 2
Ultralight, spacious 2P, but not for very strong winds.

Durston
X-Mid 1
Budget ultralight 1P, spacious, but large footprint.

Naturehike
Mongar 2 Backpack Tent (Nylon)
Budget 2P, spacious for price, but not for 4 seasons.

Ranked #1
Durston - X-Mid 2

Ranked #1
Gazelle Tents - T4 Hub Tent Series

Ranked #1
Gazelle Tents - T4 Hub Tent Series

Ranked #1
Durston - X-Mid 2

Ranked #1
Durston - X-Mid 2

Ranked #1
SlingFin - Portal 2