I used the Omni clear. Never again!! It doesn't hold up. I know that I'm in AZ, but I sprayed a Challenger Sublime with PPG 2021 7 years ago and it still looks great. I sprayed the Omni clear 4 years ago over B5 blue and it's yellowed and flaking away.
Plus, after seeing the base color where the clear is gone, the Omni cleat is not that clear. The color is much much darker with the clear over it than without. Maybe the better clear is the same, I don't know.
That's my experience for what its worth.