I also use Duracoat's U/V Guard and have been happy with it's performance so far especially with the chemical resistance. It will add a minimum of 1 extra yr. protection for both U/V and Chemical resistance.
I've avoided 0-9 Frogskin after reading about issues w/ it in the past.
Gerber's Abrasion Guard doesn't claim any U/V inhibitors so why bother. You can scrub on the Duracoat U/V guard with alcohol and a rag and it hold up very well.
What I don't like about it... Everything about the soft flimsy cartridge.