I prefer the Blue Force Gear VCAS. Primarily due to the adjustment mechanism. It is robust and easy to use. The problem I had when I was trying out hte LT/VTAC was what many others have had, the tail. I had issues with it and the adjuster , grabbing one istead of the other unless I was looking right at it.
Another reason I like the VCAS is that the webbing material is very heavy duty. I think it would be very difficut to wear the sling out. My Viking was showing some fraying on a wear point in about 6 months.
The padding on the LT/VTAC would never ride exaclty where I wanted it to. So I would spend part of the time moving it to where I wanted it, and then having it move back to where I did not want it as I would run the weapon. So unless BFG get this resolved< i will be sticking to unpadded VCAS
eta thought of more