In my personal opinion, Honda makes the best engines (found in the better off brands.)
As far as for use on cars, use only the white (or black) pressure washer tips.
With gas powered pressure washers, the tips are color coated indicating their spray angle. The spray angle determines the cleaning pressure.
The color codes are:
Red for 0°, (heavy blasting, you could cut steel),
Yellow for 15° (for tough cleaning)
Green for 25° (general cleaning)
White for 40° (delicate surfaces) and
Black for 65° (mainly for use with or detergents or rinsing the soap off).
There are a bunch of accessories you can buy for use with a power washer when washing cars. I have several, such as a foam cannon, wheel cleaner and final rinse solution thingie. Plenty of YouTube videos on this subject.
Always use low pressure for cars and wood; higher pressures on concrete. Have a special attachment for cleaning driveway and patio. What used to take 4-5 hours, now only takes one. It's a rotary brush surface scrubber. (Buy the Yamaha brand, lot of Chinese junk sold on Amazon. Pay a little extra, worth it. Mine is 15 or 20 years old, still looks and works, like new.)
As for the pressure sprayer itself, I bought mine at Sam's Club 15-20 years ago. (They usually carry top quality products that you can depend on.)
Mine's an off brand, brand is Simpson, has 2800 psi @ 3.2 gpm which is plenty for my needs.
I bought it because it had a Honda overhead cam engine, and it has ran perfectly over the years. Starts easily, every time.
Even with year-old gas. (That should trigger a bunch of thou-shalt-not's ... grin)