The upside of a raised rest is better arrow clearance, and they seem easier to tune than shooting off the shelf. The downside of a raised rest is that it puts your hand further away from the arrow, which makes canting the bow problematic. I see no advantage in using a raised rest unless it has an effective flipper, like a magnetic flipper, because you’ve done away with the upside, and still have the downside.
Some few bows are impossible to tune off the shelf, because they were evidently designed to use an elevated rest, period. If you have one of those bows, then end of discussion.