S -
You're never going to beat a flipper rest and plunger or consistency and tune-ability. But that's not always an option on all bows. The bow obviously needs a bushing for the plunger and the sight window has to be cut far enough past center shot for the plunger to work (properly). If you don't know how or care to tune a rig, it's a wast of time.
Next you have simple stick on rests. Despite what you might hear, they all do the same thing. The cheapest is the Hoyt Super rest, and the design has been around for over 50 years. Brush rests, feather rests, the "heavy arm" rests like the Bear Weather and even stick on flippers can actually be lumped into the same category.
Lastly, shooting off the shelf has only become popular in more recent years. 50 years ago, no one who shot seriously would even consider that. First, your tune has to be spot on and that implies your form is consistent. But then again, using a stick on rest on a Hill style longbow, may not work that well and just looks fugly.
I shoot my LBs off the shelf, "trad" (vintage) bows with some type of elevated rest, and ILF/Olympic bows with a flipper and plunger. BUT, what I or we do should have little bearing on what you do.
Viper1 out.