What's the deal with Prophesy of Pendor?
Chronicles of Telara or whatever its called is not export-compatible with anything else. And its very very hard. I appreciate it though because its original. I think when that one gets more polished it will be great. Right now it seems difficult to build up an army and there are too many roving bands that team-up. And for all its attempt at story and quest and RPG-ish, I have not been able to figure out the feel of the world.
Conquest is new and simple. But simple is good. Good items and kingdom management...otherwise not so different from Native.
Native Expansion and Sword of Democletes (or however its spelled) are similar, with each doing different parts better. I would say SoD is better, except for one big exception...I personally don't like the troop trees.
edit:
Horde Lands, IMO had potential to be great, and better / more skins than Chronicles of Telara. But I have not heard anything on this for a while. Its has less quests, but more race models.
I do not like the Star Wars mods very much, but they certainly have lots of weapons and races.
When The Last Days come out this summer...everyone will be playing that. In fact, I imagine that may be published as a stand-alone game or packaged with future additions of M&B.