either converter will do the job in the 11's, but they will do it differently. The PTC will pull the engine down harder on the shifts and it will allow you to hold each gear to a much higher vehicle speed. The Vigilante will do the opposite, with very little RPM drop on each shift and lower vehicle speeds at each shift. When the lockup clutch is engaged it will pull the engine down really hard and it will go through the traps at a "real" 0% slip, whereas the PTC will have at least some slippage.
I prefer the PTC for a faster car, especially if the engine is done up with ported heads and a hotter cam. It does a good job of keeping the engine in the power band and I think it's easier on the driveline. The 5 disc lockup can really do a number on the transmission and it can also pull the engine down out of the ideal powerband when it engages the lockup clutch.
Either converter will need to be dialed in to your particular combo for best results, and you may need to make adjustments to your valvebody or governor to get the shift RPM's where you ultimately want them.
