Kristian,
The J8 is incredible. Actually, it was love at first sight, so there was obviously some bias and rose colored windshield involved. The Rubicon Overland is a much better trail machine. I did some simple testing yesterday, and the thing is a beast. The 35" tires with the Nth Degree Suspension precluded the need for lockers. Even at street pressure.
For the J8, I loved the diesel. It is a great motor, surprisingly fast and still gets 25mpg with 255/80R17 tires. The J8 is more like a Defender, or a 70 Series TLC in function. The J8 super simple.
The Overland JK stands out for its trail performance and the suspension, though the engineers and designers did a great job of retaining a strong sense of simplicity and function too, with the flat load floor, canvas seat covers, lack of bling, etc. I like that.