Rustoleum vs. POR 15 vs. others

I tend to be rather anal. every bit of the rust gets the converter put on it first than all the loose and heavy stuff gets taken down, than treated again. And than taken down to bare metal and yet treated again. Every coat of treatment I leave on there for about 24-48hrs. The Napa stuff seems to penetrate extremely deeply into the rust. If it is an area that I need smooth the only filler i'll use after the final treatment is All-Metal, the adhesion is scary strong, takes a grinder to take it down when its hard and doesn't rust.