In reply to jprieto: I own a Crux X2 Storm but have used a Nallo 2 GT on several occasions. Firstly I would say that these are two very different tents and aren't directly comparable. The T20 XT series from Lightwave (Crux's sister company) is the equivalent of the Nallo 2 GT, and the Hilleberg Jannu, the reverse. Personally I have found both to be very good tents, but the question really is what are you using it for.
The Crux is an out an out mountaineering tent. I.e. as small and light as it can be whilst giving just enough room to use, plus being very resilient to high winds and heavy snow, whilst giving a small footprint for pitching in small spaces.
The Nallo 2 GT on the other hand is roomier, both in footprint and particularly in porch space which is very useful for base camp use and bad weather camping. It is not designed to support heavy snow fall so if you think you will be using it in this environment go for a semi-geodesic or geodesic design like the Crux. The Nallo is very stable in strong winds but will flex more than the Crux will, and needs to be fully guyed out. The other advantage is that the Nallo is outer pitch first, which does make things easier for pitching in bad weather. Though the Crux pitches inner first (to give greater strength, so say Crux), after pitching it in heavy rain, I have found it does stay quite dry as long as you are quick at putting it up.
Basically unless you are going to be using this on a mountaineering expedition (or camping in Scotland in winter for extended periods) where you expect plenty of snow and limited space to pitch a tent, I would go for the Nallo 2 GT as it is more versatile.
Either way both are superb tents, but I would urge you to look at both pitched, and ideally watch them being put up, so you can get an idea of what each will be like to live with.
Hope this helps!