I am about to finish cadwell's gold, and I clearly feel that three alliances' quest are done by different groups.
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DC's story,character and battle are the best. High King Emeric is definitely the Most wise leader and he cares for his subjects (he is in all five maps to stablize DC). Others like Darion, lady Laurent, Sttibons…they are Very well designed and have personality of their own. Also though main quest lines have to be in normal difficulty, DC team managed to have different kinds of battle (control fire ball from above, fighting a ghost army etc).Overall DC is the Best in all these designs.
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EP has some nice stories, but stories in each region are too independent that I feel like they are forced together. You don't even see the skald king until Eastmarch, and in first three maps no one even mentioned his name. However one thing EP team did good is that the contents in each map are so smooth——you go to A B to get two quests in the area, they can be finished at the same time easily and you can expect the final quest enders are at C together——and C is usually near the region of next quests or a wayshrine. DC and AD failed on this smoothness. (However, so far the only successful character i met is Naryu, the ONLY one)
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AD……well the story is not that great and you need to running around to get quests and finish them in different places. The story is not great neither, characters are poorly build except Queen Alyenn(who became a mere NPC in the last two maps)and Ras. One thing though is their art work……it is the Best among three, and I don't think I need to explain much about it (the great tree, Marvelous device, cat temple and glowing Ancient cats, and don't forget the only good NPC with enchanted weapon——the vampire hunter).