Personally, I'm enjoying some of the new mods in monster (especially blood magic, which is unlikely to hit DW20 packs in the near future), but I've had to disable others.
DW20 is the Apple of the packs. Works well, and does what's needed, but more tricky to modify. Monster is the Android, offers all the tools to customise to your taste, but a little more complex and overwhelming at first glance.