I love these figs, I want lots of them all!
Anyway... it's a tough choice to choose only one army builder fig. In my opinion, there isn't really one fig above all else for army building if you look at it in the way of "what fig do I see myself actually
needing an army of for a MOC I want to make". I mean, the spartan is obvious as an army builder because of 300 and such, but I'm never going to do any such scene. The elf is great, who doesn't want a lot of him? But as others have mentioned, he isn't that easily customizable because of the hair, and additionally, I don't ever see myself making a large forest scene where I might need bucket loads of elves (I wonder if someone is ever going to quote this post and prove me wrong

). The forestman is of course cool too, and more easily customizable, but again, I don't see why I would need more than a small group of them. And the musketeer? Well, I think 4 will be plenty enough of him for me

.
So, now that I've dismissed all of your Fabulous Four as army builder figs to my taste (when talking about army building, I'm thinking more than just 10-20, but more like 50-100 at least), what figs would I choose as army builders? From series 1, I see 3 candidates: the zombie, the robot and the ninja. I'm not that into zombie-stuff and the robot just isn't cool enough to amass an army of (I'm thinking about Cylons and stuff

), and the ninja has kind of lost his edge with ninjago. But I'd personally love to have a huge army of ninjas

. From series 2, there really isn't any good candidate to battle the spartan. I hear Quarryman is trying to amass a load of them to make a roman army by using only their torso and legs. I think that sounds cooler than spartans at least... From series 3 there's the mummy and the samurai. The mummy, like the ninja, kind of loses it's edge with Pharao's Quest, but other than that, like the zombie, he's a great fig for a horror army. But if I'm going to have an army of ninjas, I would need an army of samurais to battle them

. From series 4, it has to be the viking and the sailor. But since I'm not that into ship building (at least not yet

), I think the viking would be my favorite army builder from this series.
So all in all? I can't really decide, I guess I'm not really an army builder anyway. Needless to say, I voted "other"

.