Sajnos személyes tapasztalatom nincsen egyikkel sem. Nanoxia más tipusával már volt gondom, az nem volt rossz. Sharkoon-t viszont passzolnám, én sem ismerem sajnos...
Sharkoon-cúszócsapágy
Nanoxia-nekem semmi extra nem tűnt fel,de ilyet ir az oldalukon a "jó marketing osztály" :

"The quiet running and long-life cycle of the fans is achieved by means of a bearing made from a composite material of the nanotechnology. This fan mount was developed especially for industrial purposes and allows effective operation under difficult conditions. Its design prevents the infiltration of impurities – so that it can work efficiently both under water and under extremely dusty conditions. The bearing needs no lubricant, since there’s no wear debris nor other contaminations in the bearing case."