I'd think that any faction that starts on the 'edge' of the map is good for migration campaign because it provide player with time to build up with out having to fight in the first 50 years or so. I did once with Sweboz roleplaying as Cimbri and Teutons. I went as far as Pyrenees and Greece (separate forces) then I ran out of good troops and money so I concluded the campaign there.
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