As I've mentioned elsewhere, of CVP, Brown Flake, and Vintage ... Vintage is hands down my favorite.
CVP usually gets all the love, and from guys with great VA palates, so YMMV. But to my palate, CVP has a strange acidity that I don't care for.
And F&T Brown Flake is, to me, one of the more boring things I've smoked.
Vintage isn't what I'd call exciting -- it's just perfect. There are some more exciting VAs to my palate, but I wouldn't want to smoke them day after day, as they'd get overbearing. Vintage is understated balance: it hits many different kinds of VA notes in a complementary way, just strongly enough to notice if you're noticing, but just subtly enough to smoke all day, every day.
(I've never had Blackjack, though. I'd like to.)
As Cosmic said, though, noticing the difference among VAs can be compared to noticing the differences among teas. If you're dialed in to that, the differences seem obvious and appreciable. But if your palate is bombarded with more obvious flavors all the time and your taste has been tuned in to those frequencies, you may not "get" VAs for awhile. (And that's OK, enjoy what you enjoy).