Holliday gets an immediate boost in fantasy value going back to familiar league and familiar opposing pitchers. Not to mention having Pujols batting near you.
Wallace's value as a prospect takes a slight hit I think.
+ Moves to a league where the DH is in play. His D at 3B is questionable and he will likely settle in at 1B after a few years at B, having a DH for off days and just an extra place for a big bat like his is just a bonus.
- Will have less protection in the lineup around him when he breaks into the majors as early as next season as a call-up.
+ Does not have Pujols blocking him at 1B
- Will play now in a less hitter friendly stadium in OAK.