I owned a Tachi but haven't had a Shen Hao. Things to consider are the bag bellows, you can get movements (just) with a 75mm on the Tachi but not more than that. Base and axis tilts on the Shen Hao if you don't like having to refocus when you tilt, Graflex back on the Shen Hao if you like the idea of pano roll backs, etc.
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