OK, I'm not exceptionally knowledgeable about the Marshal, introduced in the Miniatures Handbook, but I do know about the Dragon Shaman in the PHB2. And from what I know of the Marshal, it seems as though they are akin to each other, with the Martial being, obviously, more martially oriented than the DS. I'm wondering if this is actually the case, and if so, which one most people tend to favor. I personally quite like the Dragon Shaman, since they get the majority of the Draconic Heritage feats by leveling up, without needing to actually take them as feats! They just strike me as quite cool.