Which Grabber? The Grabber A/T is a wolf in sheeps clothing as far as all around grip. A surprisingly great off road tire!
The first question you need to ask is what kind of use will the tires be subjected to. I had the Revo's for a while. Back then I hardly went off the roads anywhere. But when I did, and as long as you air down the Revo's, they were just OK for light duty trails.
If you are planning on often heading out, the Grabber A/T's are a real bargain that offer plenty of surprising off road grip as well as on road grip plus they are quiet.