To a Caribbean origin audience, Salsa and / or Merengue are "tropical" (although nobody calls the format or the music by that name). The format on Rumba is basically Spanish CHR or Spanish rhythmic/Churban or, simply, reggaetón. It is not "tropical" by any definition.
WEMG is a mix of salsa, merengue, bachata, reggaetón and even some Colombian vallenato. It is the closest to being what might be called "tropical" and that is how they are defined by MediaBase. WHAT also includes some classic salsa, but is much more reggaetón based