I do not use either.. What i do is polish it out after each coat of clear from 3200 grit to 12000 grit polishing cloths and then after the last one ( i do this 3 times and after each time going through the grits i clear coat again) i then use Clear one more time and i shoot 3 coats for the final coat and that make it look like a toy car.
http://public.fotki.com/shawCustom/shaw_show_cars_for_2004/100_6049.html
Pluse look through all the folders and you will see my F/W Roadster that one is on the first stage of it not even close to being done when its done you will see the motor in the fire wall like a mirrer