I have tried them both at percentages from 3-10, I like stronger flavors and while they were each OK alone they made some really good recipes when mixed with Bavarian Cream, Caramel, Vanilla, and some Cocoa or Chocolate. I've used TPA and FA on the Bavarian Cream and Vanilla (used TPA Vanillan) but I think the FA flavors on these were better. I'm at work now so I don't have the percentages, I just started making different percent batches of 6 ml and made some really tasty juices. In my "lab" I have about 60 6 ml batches of different flavors, my taste buds must get bored easily.