Just a front bag, but not afixed to a benchrest? If that's the case a bipod makes it easier to align with the target by using a squeeze bag under the butt. It takes a while to set up a front bag and a rear bag to get the heights lined up when using them together, or you can use a squeeze bag in the back as well.
I think if you have a very sturdy and stable bench that does not move at all, coupled with a top of the line benchrest set up, then you can realize a sight advantage with this system, especially so with a super precise rifle. If any of 3 mentioned parts of that system are compromised then any advantage is swallowed up. There's a reason benchrest shooters in other rifle disciplines use these.
The bipod is faster and requires less effort to transition from target to target. It is the most convenient method to hold a rifle in most any situation one would need to steady a rifle and works great.