D,
I didn't compare the KO 2343 and 2344 for myself.
I asked Josh Cyrul about it, and this is what he said.

PSI Racing - I prefer the higher torque in my gas cars. I used to always choose the speed for the steering but after I tested a few different servos I then opted for the high torque as I liked the feel - less twitchy off center but it did seem to have more steering in the higher speed (higher load) corners. I'm not sure what Ralph uses...