If it's not a polearm > 150 length, I like the option of being able to stab them outright or bumpstab with the lance at a moment's notice. With the heavy lance, I feel I have to prepare for the bump stab ahead of time and can't react to them going to the defensive as easily. That's why I like both lance and heavy lance equally in upfront attacks on infantry.
Also, I have 5PS on my current heavy lance guy 15-24, so that's why I have a certain bias about my attacks and have to use whatever damage multiplier is available. KD is only 4.5 but I do play cav on maps like pueblo village/city maps sometimes. Huseby, you have improved, so I think yours would have been higher if it had been reset. I think kd (and score moreso) is pretty indicative of performance even if it's not perfect such as killing peasants or leaving on disadvantaged maps.