I got the Kranzle because I wanted to get a quality unit that was designed to last. From all the reviews, if I ended up purchasing to Karchers, I could have got a Kranzle (my rationalization).
It is designed to last and if you have a problem it can be repaired. You get a lot more with the added cost but just depends if you want to buy the best:
Adjustable pressure, real pressure guage, heavy duty cord, robust connections (brass), GFCI cord. It weights a lot more since due to the castings and brass.