well,
Crossmaxs are definately more bling.
however, a well laced 3x set of 517s on 240s in my opinion would be stronger.
overall hub quality on the Hugis is better, and maintenance is easier.
if you blow up a crossmax wheel your stuck for a while until you can get another, blow up a 517/240 and your riding the next day as long as your LBS has a decent rim in stock.