Wasat, I have never tried either of those 2 products, but I know of several who have used the chassis saver and they all liked the results.
i am about to start in on my frame and would like to get some feedback on other products as well. For now, I have sanded out the frame and I have a light amount of pitting/rust, so I thought I would try rust mort. After that, I will spray a self etching primer followed by some sort of chassis black....
Dano