The Viper branded mf towlels I believe you are referring to are named "Detailing Cloths" and are really used for (imho) for wax removal, door jambs, and other grungy jobs. Even though they aren't as plush as the Magic Towels, they are still very safe for your paint.
The Magic Towel from CMA and the Ultimate (?) towel from Tacscar & YoSteve are very plush are are great for QD'ing, drying and other types of use. Keep these away from areas that might be greasy (like door hinges) and such. I use several Magic Towels to dry and then wring them out as well as I can and go over the interior with it.
The "Detailing Cloths," being cheaper are better used for dirty areas like the door jambs, underhood areas and such and if they get trashed, keep them around as shop towels for wiping off a sweaty brow!