Sorry i'm about to put my Nerd hate on..I think both fenders are formed using the same type of bender or similar. Actual "Rolling" steel is a different type of machine used to make a very large radius vs an actual tube bender used to make a tight radius. So with a true high quality tube bender you are actually "Rolling" the steel over the Die set. The smoothness of the radius and bend has nothing to do with the bender (unless you're using a cheap pipe bender then you'll get very noticeable shitty looking kinks in the bends). The smoothness of the radius has to due with the geometry of the design. so to get that smooth transition from radius to radius each radius should have the same center point. I'm sure both companies made their designs intentionally. I don't see anything wrong with the PS design, for being steel tubing i think it's a good design.
I didn't know PS was a china brand? Why do they say "All of our products are 3-D CAD Designed and proudly Made in the U.S.A." in their website? if for some crazy reason i wanted to drop over $1,200 for fenders i would be expecting a USA product for sure.