These two charts of excellent tunes on both the SE255s and TW6-6 show you won't be disappointed with either.
SE255s
TW6-6
Comparing those 2 charts I would have to go with the SE255's. 90ft lbs tq off idle and making damn near max torque by 3K. The TW6-6 torque curve isn't nearly as flat. But that could be tuning characteristic of 2 different tuners in 2 different areas.