Ligularis is a pleasant enough fruit but ddoesnt enjoy the tropics being more subtropical in its preferences. I personally find them a bit bland even when sweet. I cant help but compare them to top shelf flavicarpas and they are not in the same realm at all.
The term granadilla is reserved exclusively for the giant passionfruit in my part of the world where they have been a backyard feature for over 100years. Some selections of these have better flesh with honeydew tones but generally flesh is bland but can be stewed and the pulp mixed through afterwards fo improve the flavour.
So far as P.edulis edulis goes I recently got a batch of sweethearts with reputedly taste better than the esteemed misty gem which is the standard and they are larger. I did a taste trial of these with Ernie flavicarpa, a prince of passionfruit and was surprised at the gulf between them. The Ernie flavicarpa blew the the edulis out of the water in terms of complexity of taste profile, sweetness and on any other characteristic you care to name when tasting fruit. I'm not sure misty gem is yesterdays adulis if sweetheart is that disappointing.