Brown doesn't have nearly the same pedigree IMO
Brown:
127 ERA+, 211 Wins, 68.3 career WAR/45.4 7yr-peak WAR/56.9 JAWS
Halladay:
131 ERA+, 203 Wins, 64.7 career WAR/50.6 7yr-peak WAR/57.7 JAWS
They seem similar but that +5 in peak WAR for Halladay tells a bigger story there as does Black Ink which doesn't favor Brown much because he simply wasn't head and shoulders above his peers while Halladay definitely was for a time. Brown pitched in an offensive-heavy era but wasn't better or even close to the Glavine, Maddux, Smoltz, Johnson, Clemens or Pedros of the world.