in my short experience, have proved to be about the same as wooden frames.
I don't have enough experience to state emphatically, that one is better than the other. The Pierco is of course a no hassell install which I think has merit.
I didn't notice any more burr comb one way or the other. Both have burr comb and to state that bees will do something more one way versus another way is, well...
I, this past season, had two setups/colonies side by side, one had drawn comb with wood frames, the other had virgin Pierco frames straight from the shipping box. During the honey flow the end results were about the same. Both hives have nine frame medium supers evenly spaced with metal spacers. Both did not suffer any burr comb build-up, at all. In fact I would say that the bees had done a perfect job; The frames/built up comb was filled and puffed out pass the frame wood/plastic making cutting with hot knife a simple process. I would say a perfect job by the bees.
I "concluded " that bees WILL fill, with wax, honey, brood, pollen if and when they need to.
I did notice that keeping the frames, when newly installed, tight against each other, tended for them to be less burred. Even then, some of the deep frames were filled out with comb, past the frames causing the next frame over to be filled but recessed somewhat, allowing for the appropriate
bee space, however, uncapping frames filled lower than the surronding frames is somewhat more tedious. HOW'S THAT FOR A FRAME-UP???
I also concluded that conslusive findings about what bees will do or not do is not at all conclusive.