The best MILK chocolate flavor I've had is Capella's Chocolate-Glazed Doughnut. I used it for American milk-chocolate candy flavor in recipes, like the coating of Butterfingers candy bars.
Notice that's all in past tense, because I detect 'custard notes' in that flavoring, so I don't
vape it any more. I've been working on chocolate recipes without those chemicals. Most of the popular chocolates taste like chemicals, alcohol, or (at best) toosie rolls. My best results are with FA Cocoa as an ingredient. In my opinion, nobody's chocolate makes a good single-flavor
vape, but FA works very well as an ingredient.
I have some very encouraging results. See my blog (click Blog Entries under my avatar) for Basic Cocoa Cookies and Chocolate Lava Cake. They're darker flavor than milk chocolate, but they're the most realistic chocolate I've vaped. Stay tuned for Terry's Chocolate-Orange, which I'm
vaping at the moment. It has a lighter chocolate flavor. Once some friends have passed judgement, I'll post that recipe there, too.