I run a fully upgraded PDI based L96. I've got the chance to try out an upgraded vsr 10 and I wasn't as impressed with it in comparison to mine. I think the benefit of the vsr 10 is the weight difference and size difference between my gun.
I recently saw a person show up to a game with a svd. Not upgraded at all, but the overall look and bolt action sound was just pure sexy.
It really comes down to personal preference and how much upgrades exist to get the rifle where you want it to be. I say go to a game where someone will be using one in a game and watch them use it in the game.
... Just call me Blue ...