If the budget is 8-10K increase it upto 12K and get the Karcher K2. All chinese washers are crap and unreliable. I have been using the K2 for 2 years and not even a scratch on it .
Foam depends more on the Foam Lance you use and the shampoo you use.
For best foaming buy a MJJC Foam lance from AliExpress cost around 2.5 i think since dollar is up.