I would assume that spiders are the dudes from The Hobbit that were massacred by an invisible Bilbo. I recall them having some sort of society or something... And, of course, there is the obligatory appearances by Shelob. Really, spiders were a pretty big deal, but they tended to go out of their way to stay out of everyone else's way. They seem more sensible than the dragons which basically never seemed all that organised or common. I am voting for Dragons pretty much just to hear how that would even work...
To let everyone know, I played this mod 3-4 years ago, so I have a basic idea of how things work. It was pretty buggy then, but its supposed to be all fixed up. So if its not, this might end up shortlived. I was kinda hesitant saying what (at least the starts) are like since I kinda didn't want it to influence the poll. And a lot has probably changed anyway, so its outdated stuff from 3-4 years ago. But don't think it matters, help give an idea before its decided on 1st. I'm going to say all this in present tense, but like I said, its old info that may or may not be the same. But I suppose more information makes it a lot better to decide what to play.
The spiders you use giant hordes of them, they are pretty weak to be honest (and at the time there was only three types you could ever get) but there is just so many of them in each "squad/horde". Their surrounding area isn't so bad to deal with, but it does get a lot harder once you branch out. They are kinda like a zerg rush kinda thing that use overwhelming numbers.
The ents were interesting. In the ent game I did, I took over isengard and resided over the white tower. That was pretty cool. They are REALLY strong, but...it takes sooooo much time to recruit them. So you replace the speed of recruiting with just pure strength. Kinda OP back then, but with that said, I lost all my ents in one battle (really weak to siege) and just couldn't train enough up in time. So still a challenge in that regard.
Dragons were the most unique to be honest, but more strong than the ents. They died easier to siege than the ents though. You got basic human troops as fodder, but a queen dragon would lay an egg and eventually hatch into a dragon hatchling that eventually grows into an ancient dragon. If you thought ents were slow at making new units (besides the human ones)...dragons two or three times slower. And oh wow were they strong as heck. Once I got past the VERY hard surrounding area (each "cave") that surrounds your starting area is guarded by dragons and its hard as heck to get past them all. Once I did that, it wasn't too bad to sweep through. However, I had both gondor, the freemen, the dwarves, and mordor all declare war on me and I got overran.
The pirates to be honest, had by far the most developed gameplay for minor factions. They had roughly the same amount of buildings and units as gondor, mordor and the other "main" factions had. They played kinda typical to gondor/mordor, so not really too much unique gameplay there. But the mod creator did the most work on them as far as minor factions go. Pirates (for uniqueness) also got elephants by conquering the guys (Harad I think) down south in the desert. That and I was able to do a lot of sea-based raiding on Gondor and go all over the place on the sea.
Isengard wasn't changed from base mod. So, its just Isengard. Not much to say lol.
Gondor and Mordor pretty much fight each other. Being Mordor is fun to take over Minas Tirith, but wow holding onto that city is harder than getting a rocket to the moon rofl. Literally giant stacks of Gondor units nonstop attacking Minas Tirith to retake it, over and over. And opposite of that, Gondor fighting Mordor is just as hard. Gondor and Mordor both got a ton of changes and new events, but I don't remember what those were and don't want to read to look, would rather just see it in-game.
The only problem I have with actually playing Gondor or Mordor, is while I can go on to other objectives, really I just want to fight the other guy. So it gets kinda linear and samey, but if I'm Mordor, I only will ever want to conquer Minas Tirith as my major goal. Every game as Mordor. And after that it opens up to other things. And Gondor I just want to take over Mordor. But that is also partly how its setup to do anyway, but as fun as that particular scenery is, doesn't give any options at the start but one.
I did add them to the poll though, since they are a lot of fun and they are most developed honestly out of anyone. But the others are just as fun too. Except if Mordor for example, the only goal to start with is to get Minis Tirith