I have tried at least 6 different makes/compounds of pads over the years(very old!!) I get ferrodo free from a friend who has his own shop, I BUY ebc YELLOWSTUFF, I'll let you work out why, don't bother with ebc greenstuff it's rubbish.
I use el cheapo discs and replace every 2/3 years, or every pad change, I use drilled discs.
tabetha