what's your focus? profitable bosses? quickest bosses? BIS bosses?
not all fastest bosses are worth, specially due many mini-bosses are really quick (grimvale quest+asuri, bk, kroazur, etc)
not all worth bosses are fast (more than 3 HOD daily bosses, more than 3 Grave danger bosses, other bosses from forgotten knowledge than tenebris or lloyd, other cults of tibia beside leiden)
the worthest one tho are: 3 grave, 3 hod, oberon, urma, scarlet, new bosses, faceless, brain stealer.