Why would you say so? Is that macro species diversity? Or sites diversity?
I noticed Romblon before, as on iNaturalist there is a "hotspot" for cartilaginous fish there: But the observations are so few that it is not possibly to draw any conclusions from that.
I also found these opinions that southerne Leyte is not the trip: But maybe these opinions come from when there was no direct ferry to Mactan?
I also read that the visibility in Malapascua in December and possibly even January is not really good, is that true?
Anyway, I would probably have only time for two places only, especially if going to Anilao and somewhere south.
Given our interest in macro, it makes sense going to either Dauin or Anilao, or are there any other places like that? Leyte seems more like Komodo - diving is amazing, diverse, everything is beautiful, but one does not see as many critters. But maybe I am wrong on this?