From my few grows I have under my belt now, and the experiences I've had playing around with different methods of drying, trimming, and curing, I would have to agree its going to be subjective to each person, and there will be subtle differences with most methods.
Hands down I agree, it is super easy to do the final trim when cutting down plants and hanging them up, the bud comes out looking the nicest, and puts out a good quality smoke due to less leaf, which usually means it will be smoother.
The advantages with the different methods of leaving sugarleaf and/or fan leafs during drying / curing impart their own uniqueness to the process as well IMO. Remember the dry is about managing water content, and the cure is about fermentation happening, breaking down sugars and chlorophyll (bad taste), and converterting all sorts of things from one form to the other. Even though it is no longer connected to roots, there are metabolic processes happening, and things being transported from the leaves to the buds, and within the buds. Jar curing takes advantage of the same effect. Another thing of note, is that leaving some leaf on, also to a degree protects the buds themself from a good deal of abuse. When I have seeded buds from breedings i've done, I usually store it in the dried buds with the fan leafs wrapped around them, while drying out for long term storage.
But again, for killer looking buds, and ease of trim, removing it all at harvest is surely the best way from my experience.