viair or arb air compressor?

i know that arb make good quality equipment and am looking at getting an onboard air compressor.

which one would people go for out of the arb high capacity or one of the viair 400 ones?

ive never heard of viair until today so thats why im slightly dubious.

thanks in advance?


ARB:

http://www.ebay.co.uk/itm/ARB-High-...arts_Vehicles_CarParts_SM&hash=item335bd11631

VIAIR:

http://www.mattsavage.com/acatalog/compressors_portable.html

does noone have on board air or an oppinion? lol