Form or function really, its up to the individual, my Haf X sits under the desk so I rarely see it, its not actually quite as ugly as I thought, but it ticks every box on the list in terms of, massive amounts of space to work in, support for massive gpu heatsinks on a couple diff cards, good for cable routing, etc, etc.
Corsair, for me, is less functional, less good cooling, space, function, etc, etc, but much nicer looking.
Ouch, I thought i'd check for the sake of it just to check I wasn't talking about the wrong Corsair case. The Haf X has gotten silly expensive, I got one only a few months ago for £110ex vat, but its like £160 now, ridiculous. It is, IMHO a lot better than the Corsair but, now more expensive. Not sure if thats OCUK prices, a Haf X at along the lines of £130 is pretty much unbeatable, at £160, its less good value but still a good case.
No idea why the price would go up so much though.