One benefit of plastidip over paint is if the body cracks somewhere it does not show. The dip is permanently flexible. I already has this happen and you would never know. I figure the plastidip is perfect to atleast make the car look good and for the body to develop any problems before I either redo it again or end up painting it.
Paint is definitely a better permanent option as it is easier to fix small imperfections if needed and is overall more durable. I can say the dip is very abrasion resistant and resistant to any chips ( I have had it on the front of my mustang for years without any problem.
As far as using pearls with plastidip, it does look awesome but I am not sure the finish is as durable as a standard color plastidip. Time will tell how it works out.
One negative to plastidip is it will be stained by gasoline so you have to be very careful when filling up.