Both games are kind of "do the thing," I think WW has a better layout, BSD has a better theme IMO, although WW has its own charm. Music and sound, BSD wins, as well as having an actually fun video mode. To casuals, I've noticed that they tend to rather play BSD. But to me, both are keepers. Set them up hard and they are addicting as all hell.
EDIT: Also- MIST multiball??? That mech underneath is one of the COOLEST mechs in all of pinball.