Um...Some companies often put Dummy or unneccessary files like: trial, demo movie...etc to increase file size, that is why Dummy Cut version is out in order to cut-off those stuff, only Original Game remain but no damage to the game itself ^^
In some special cases, Dummy Cut will freeze or crash the game, it will need Patch to solve the problem :D
My personal always go to Full Version but it is depend on game and company whose made it, looking at my uploads, if you see a game that only Dummy Cut available, that mean it is first point I am talking above, strongly recommend, an example is games by [でぼの巣製作所]
But a game with both Full + Dummy Cut available, go with Full Version instead, an example is games by [C:drive.], [ルネ], [ルネ Team Bitters]...etc
girlcelly