Well the V3 is probably the least attractive of the two, but it has a nice utilitarian look to it and people seem to say it hits like a champ, believe it also has a floating pin.
I personally have always liked the K100's, especially after seeing the pics in the FT thread of the one with some of the anodizing sanded off.
People also seem to have positive things to say about the KTS in the FT thread though some videos ive seen mention issues with lock ring over tightening causing you to accidentally screw out the whole firing button.