I think one of the main difference is that V3 provides you the ability to change the ride height and a few other tweaks on rebound and sportiness adjustment. But honestly I don't think you can go wrong with either option of V3 coil overs or Koni shocks with OE springs.
From experience I think any setup that is a full coil over happens to have a sportier/harsher ride, even if you put it on a softest setting.