I find with TPA and cap that there's more of a range of flavours, from the 'in your face' to the subtle.
FlavourArt flavours are in your face, no subtlety about them. Gonna be a random analogy here but take 10% of each, say you want a cup of coffee - TFA, cap, inawera is a cappuccino, and FlavourArt is like chewing on a roasted coffee bean it's that potent. An advantage of FlavourArt is you don't need a lot of the concentrate to make the flavour to what you want.
It's all subjective though mate, personally I don't touch FlavourArt but other people swear by it. Best thing to do is try some yourself, but it's generally advised to not mix FlavourArt at more than 5%