The V12 3 port rody is stronger. Primarily because the V12 series in general is better than the X12 series RB mills. Rody know how to mod an engine and I am definitely impressed with the Rody mods. Some of the other top mod guys do just as good of work. The JP mods done by Richie are hot and so are the Hottinger engines. I can get RB support here local though so I am kind of fond of RB engines.