OK so the only benefit I can see is that if you had multiple taxonomy fields in one CPT all pointing to the same custom taxonomy, then if these fields were of the regular taxonomy type, all chosen values would be set the same after saving, whereas if they were all of the taxonomy advanced type, all the selections would be preserved as the data is saved into the postmeta.
Not sure why you would have multiple taxonomy fields in a CPT pointing to the same custom taxonomy though.
.
