Simple meters (those with 2, 3, or 4 "on the top") are divided at one level: SW, SWW, and SWMW for duple, triple, and quadruple time.
Compound meters (those with 6, 9, or 12 on the top) are divided at a second level: They are derived from simple meters, typically on a three-for-two basis. That is to say, 6/8 time derives from 2/4, but with three eighth notes per group rather than two. Within each group, the pattern is sww. So we have
compound duple: S(sww)W(sww)
compound triple: S(sww)W(sww)W(sww)
compound quadruple: S(sww)W(sww)M(sww)W(sww)
This may not be important depending on your application, however. One place it comes in is notation: Depending on how austere you want to be, how you notate your notes and rests depends on where it sits in this beat strength hierarchy. In 3/4 time, for instance, one can half a half rest followed by a quarter note on beat three, but a quarter note on beat one is followed by two quarter rests, because "you don't combine a weak beat and a weak beat in a rest". (As I say, it depends on how austere you want to be.)