KM2 if you're going offroad much and are near mud. I think the MTZ may be a bit quieter on pavement. As for me, I just got the MTR but I love the KM so I suspect I'd love the KM2.
2014 JKU Rubicon- all white with tan leather
LOD front bumper, AEV rear bumper, TeraFlex tire carrier, Shrockworks sliders, Method Standard wheels, 35" MTR Kevlars, Englewood driveshafts, Synergy 3" Lift, Artec truss, Teraflex C-gussets, Grabars, HotHead Liners, MORE dead pedal, Uniden 520 XL, 10lb CO2 tank...