Two cool things:
The climbing club at the UW has two Bibler I-tents, they're ancient, very beat up and each has been repaired multiple times (crampon holes patched, zipper replacement etc.), but still going strong. Top score for durability...
And, the Nallos can be pitched double-walled, or inner only, or outer only. The inner only is ultra lightweight but keeps the bugs and the light wind and precip out. The outer can sleep something like six people or whatever, at least if it's a GT, but has no floor - works like a BD megamid in some ways. And the full thing will withstand pretty much any weather when pitched correctly (snow walls, proper guyeing w/skis and such), but that's tricky - hence the much heavier Hilleberg free-standing tents. Anyways, top score for versatility...
I'd pick a Bibler for technical stuff where the small floorprint is necessary, otherwise go with the Nallo. It's a great tent.