I compared 2 sets of Vintage Vibe P90s with identical specs other than the magnet differences, with one set having alnico 5 rods and screws, and the other set having staggered alnico 5 slugs. In the end I determined that I preferred the rods/screws but the differences were quite subtle and could have been much attributable to height/stagger issues. The rod/screws set seemed to have a bit more beef.