For Performance, FIT and FINISH, you'd always have to go for Powerflex.

Changed whatever shit (Deflex/flo flex) was on my Saff to powerflex as soon as i bought it. No comparison on the finish quality of the products.

Better fitting and design would suggest better performance if they are all similar properties of polymer.
Which i doubt, as there are hundreds of compound formulas for various performing polyurethane mixtures.