Not Ranked
My understanding from the engine builders we have used are the T&D rockers are the best and $$. However they do require machining on the head (more $$). We have also used the Shelby (very nice), Comp Cams (Dove), Harland Sharp, Crane (cast iron), and Ford Power Parts (also very nice). The only problems we have had is with old worn out stock rocker arm having the adjusting screw backing out. This problem has been solved by Ford Power Parts and their slightly oversize adjuster screws. My suggestion is to use whatever your engine builder reccomends.
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