well i definately voted for the h&s, but for that price, i 'd rather own an ATI bubble master@ 500 euro, but you would have to import it from germany...
the obvious benifit to a nw skimmer is less watts to be sure, but imo, i think the needlewheel skimmers (that have appropriately matched lph of air suction as a beckett) are going to be more stable, with less effects from feeding, dosing, and barometric pressure/weather, as well as less maintenance, i.e. that blasted beckett injector that always damn clogs. but i will say that typically a really good beckett skimmer like mrc or reef concepts is going to have a build quality that will surpass most n.w. skimmers.
you might also want to check out geo skimmers as well, very long waiting period, but some of the highest quality skimmers and reactors out there, and you can get either beckett or nw, and his nw skimmers are better quality that alot of the german imported ones, mabyev not better than h&s, but as good to be sure