My center has a very heavy THS. My DV8 Endless Nightmare has been a frequent tool lately, in addition to my Elite Treason. My teammate has been using a Radical Guru Master. Other bowlers are using Locks, Alpha Cruxs, Grudges, Swerves, etc. Once the carry down hits around 3rd game, we all start moving right with the strong balls to adjust for it. Bowlers trying to use weaker equipment find themselves struggling to find a decent backend reaction.
If I had to pick between the Pitbull or the Gauntlet, I would go with the Pitbull just because of the great performance I have had from my Endless Nightmare. It is hard to beat the heavy roll you get from the high end DV8 asymmetrical stuff. Hammer makes good products too, but they have been jumpy on the backend for me in the past and not very forgiving.