We have a robens Kiowa 11man tent and it sleeps 4 people very comfortably
You really need to take the numbers of people that “fit” with a pinch of salt.
We used to have tents that had a standard tube design and this time I decided to swap to a bell tent as I wanted the Headroom. I’m really happy with it and as it is canvas it breathes, coupled with the roof vents. It’s really smart tent that is quite pleasant to spend time in if it’s raining.
One thing I would say about the air tents, is that you need to make sure that you have a power source that can pump It up. This is great if you can get your car next to the tent, but for example at a festival you will need to invest in some kind of battery power. That’s the other reason why I went for a belt end as I can pitch it anywhere.
If I was going to buy again I would stay with robens but I might go for one of the bell tents with an a-frame entrance as then you can very easily hook a tarp straight onto the front. The Kiowa is great but the entrance could be longer. I bought a tarp which I think I can jury rig on to the front and I’ll test that in a few months time.