I recommend STW, it is after all the oldest TW title and as you've described has a style and atmosphere that the sequels have been unable to emulate. For a specific recommendation, I always enjoyed the Uesugi campaign - you have a little more breathing space then most of the factions, but not enough to sit back and wait for the others to do your work for you, as the Shimazu can. Plus I always liked building up that little island region of the north coast.
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