I reckon you'd be happy with both
I haven't got the Scarp 2, but I recently bought the Hubba Hubba NX, after having the Luxe Habitat knock off for 5 years. I think the Hubba Hubba NX is great as it is really good having two doors for two people, everything goes up easily together and it is not hard to get it pitched right. There are lots of useful details on the tent that show how much thought went into it, like the tensioners at each corner and for the vestibules. I suppose that it is not too surprising considering that MSR have been making and upgrading versions of this for over a decade (I think a decade, don't quote me). Honestly though there are things I wish MSR would do more with, such as having more guy out points for stability, but the whole package is pretty good. From what I've seen there are mixed feelings about the grey outer fly, I like it because of the spacious feeling, but I know you can also purchase it in green if that is not your thing.
The Scarp can be made into a 4 season tent with crossing poles, is that right? That might be something work thinking about as an option if you plan to go hiking in winter. The Hubba Hubba NX cannot do this, but for every other season it is great.
Getting back to the first thing I said though, I think either would be a great purchase and that you would be happy with either tent.