Where I live, I cannot remember how long it has been since I've seen a P2K2 used on a track, no matter how tight the track was. If you are talking about off-road I could see the point about the P2P2 being the best on certain tracks but not any longer on on-road...especialy tight carpet tracks. I always keep a couple ready for action though but I haven't had a need in to use it since the Monster came out. On carpet, the GM is very, very rarely used. They just lack too much torque to be of any use.
In my area, the motor of choice is the Monster. Some guys run the Epic BS too though with very good results. The BS is harder to tune than the monster, has a little more RPM and a little less torque.
Those are my 2 main motors.