From what I have seen on here and my own personal experience-the GY Duratracs are THE choice for a Jeep that is going to be off road. The BFG's which I have and prefer are known for 50k puls miles but don't have the rep that the GYs do for off road. It kinda depends on what your use will be. The GYs also frequently have rebates ask/check around, by the time is all said and done, cost between the 2 is almost a toss up.
I have a '04 Sport with 2" OME lift and run 31" BFG's have been told I could go up to 33"s but would need to change wheels-and for flexing of road really should have BL as well----so I will stay with my 31's------ for now.