I guess it depends on the Texans plans. Mixon and Jones catch a lot out of the backfield. Henry not as much. If Pierce can learn the blocking scheme and learn how to run in it, I would go Jones or Mixon. It is a toss up. If the Texans don't think he can then the Texans shoukd sign Henry and a 3rd down back.
They need to get in a bidding war if that's the offer the Ravens have. That's crazy. He was the #3 ranked RB last year, and may be old, but he's durable. He only missed 1 game the past 2 years, unlike some of these other RB names being thrown out.
Jones! Much more dynamic. Also a guy with good hands who can catch the ball out of the backfield. Was banged up a little last year but looked good when healthy!