Normally, I would go with position scarcity (Wright), but the real David Wright has not stood up in several years. Steals are nice, but they diminish with age. In an OBP league, Holliday seems like a more stable investment.
In a normal 5x5 league I would want Wright as I am looking for him to bounce back. He's been inconsistent the last few years but he is only one year removed from hitting 29 HR's and stealing 19 bases. Throw in that Wright is two years younger and plays a scarcer position and I like Wright.
However, in an OPS league I think I have to go Holliday, its another category where Holliday will probably significantly out perform D. Wright.