Pick your weapon according to your application and needs.
For street/strip use, the converter should have a stall speed about 1,000 RPMs below your engines max torque rpm point. (if your engine develops peak torque at 3500 RPMs, get a 2500 rpm stall converter)
Make sure you get a converter for near your engines power range.
If you get a 2500 rpm converter for a engine that runs 200-300 HP, and put it behind a engine that ir developing 450-550HP. its real stall speed will be well above 2500. The same works the other way also. A 2500 rpm converter for a 500 HP engine will stall at a lower RPM if put behind a 200 HP engine.
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