The following was posted by L'italiano on the TR site. I found it to be very helpful when I was working through these blends...
Brown Clunee, Old Gowrie and Hal O’ The Wynd are three very similar blends, with the same characteristics. Not so for Marlin Flake that is completely another mixture. Here I want to speak about the differences among these three excellent blends, from the point of view of Brown Clunee. First of all, they all have the same ingredients (Virginia, Kentucky, Perique) without any casing. But there are also a lot of differences:
HOTW is the strongest of the three, less delicate than the others. OG is the sweetest, it is almost a straight Virginia or at least it has the same characteristics. Brown Clunee is the most spicy, the most peppery. HOTW has more Kentucky and less Virginia compared to OG. BC is really similar to HOTW, but it has less Kentucky and more Perique. Perique is really leading. On the contrary, in OG Virginia and also Kentucky are leading, but Perique is really a “bit player”. To sum up on the basis of the amount of the different tobaccos, we can follow this order: Virginia content: OG – BC – HOTW. Kentucky content: HOTW – OG – BC. Perique content: BC – HOTW – OG.
Finally, OG is a Virginia based mixture. Similarly HOTW is a Virginia based mixture but it could also be considered a Perique mixture and also a Virginia/Kentucky mixture (it is the most balanced). BC is certainly and without any doubt a Perique mixture, a Va/Per with just a touch of Kentucky. Three excellent blends, but in this case my favorite (the kind of the three I prefer) is Brown Clunee. For all these reasons, in my personal rating system (from 1 to 10) my score is 10 and four complete stars.