Having spent way too much time researching this very topic, I have come to understand that the Paul Racer uses cantilever brake posts, mounted in a different position than cantilever posts would be for cantilever brakes, and therefore incompatible with MAFAC/DiaCompe/etc. centerpulls. I have a set of the RAIDs in use on a bike currently, though not brazed on (yet.) I really like them. Also currently use a pair of Weinmanns, also not brazed on. I don't hate them... Proper set up and Kool stop pads really seem to help. And, fwiw, I really kind of lust after the Pauls, and if you're going to have braze ons added, and your choice was between the Pauls or the RAIDS, I think I'd go with the Pauls, especially given that the price is not typically so disparate.(Of course, the occasional "good deal" pops up on the bay, but never when I'm looking!)
Also, the thing to bear in mind with any of them is what size tires you plan to use with them, as some allow for wider tires than others.
I am always open and quite happy to be proven wrong on any and all of the above points.
Good luck!