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I think its about trying to maximize the Overall production.
Branyan at 3B gives you more opportunities to add offense. You can try Mike Carp or Shelton at 1st (or maybe a platoon between them) and see if one of them pans out.
Branyan at 1B opens up a spot for Cedeno or Woodward. One guy who is proving he can't hit AT ALL and the other a 33 year old RL player with very little upside.
The first option just has MUCH more upside and a higher downside as well. With Beltre out we need production. Branyan at 3B gives us more potential for that.