BTR: I have a Nilfisk and it works a treat, there is one particular attachment that you do not use on paint as it will remove it. It cam with two different nozzles as well as a attachment for spraying detergent.  Works a treat and is a lot better than my mates rubbish Karcher. 

 

You have to compare apple with apples. I think both brands are good. 

 

If I bought either of these I'd most likely consider both of them rubbish 

 

http://www.karcher.co.nz/nz/Products/Home__Garden/Water_blasters/Entry_class/16021100.htm 

 

https://consumer.nilfisk.com/en/products/Pages/product.aspx?fid=16121