I have used both in my customer builds and notice no difference. I generally use: Ferodo Disc brake pads FDB88P Platinum for Norton Commando. Mostly because they cost me a little less (Wassell) and have a good name.
I have one set of Ferodo in stock but shipping cost to you is high so if already ordering from AN, I would get the AP Racing.
BTW, my rider has EMGO and they seem to work well, but them I've had the disk turned and that is quite an improvement over chrome and especially worn out chrome.