Never used Winmax or Porterfield. I went from Carbotech to PFC. Carbotech makes some very good pads. I just thought the PFC pads last longer, and have almost the same amount of bite as the Carbotech pads. Carbotech has a bigger range of pads to choose from(last time I checked), but were not as easy to modulate as well as PFC pads. Carbotechs can be burned through very fast I felt.
**Two important things to remember with PFC is that you absolute must never use them on a rotor with other brake material on it, and you better bed them in correctly after every install. **
Ran Carbotech for 2 1/2ish years and PFC for 4ish now.
edit: I didn't think dusting was bad with either. Sonax rim cleaner did a good job on them.