I'm not having much luck finding real specs on the PDR-10 performance. The Paradigm site says "bass extension to 27 Hz" and the footnotes add "-3dB measured in a typical listening room" but there are no anechoic specs to compare with the Axiom subs.
The enclosures are about the same size and power levels are comparable, although the Axioms seem to have a bit more power and the aluminum cone should be a bit more rigid when working hard.
Based only on specs and reviews my guess is that the EP175 would slightly outperform the Paradigm but the difference would be "noticeable" rather than "night and day". The EP350 would definitely move more air and go a bit deeper into the bass.
Bottom line -- I don't know, maybe someone else has more info
