My vote goes to Karcher...but then I've only had two in the last 22-23years!
I bought the first one,a K4 series, circa 1996 or 7 and it worked flawlessly and the pump unit still does..it was only let down by the high pressure hose bursting and the expense of a new(and getting ripped of on Ebay for some cheap counterfiet one
) one made the cheap and cheerful one in Tescos for £99.99 a bargain.
3 years down the line and it still works perfectly and I still have the old one as a back up!