I’d say Green and Gold are by far the best for the money. Red and Black contain grain whiskies that in my mind seriously taint the taste. Blue is good and all, but there’s no way I can justify what it costs. I paid $120 at a duty-free shop and even that was way out of line (especially since Gold was $37).
I’ve never had the Gold. Or even seen it here, for that matter!
But I agree, the price for the Blue is insane.