Check out my review I posted yesterday, after having a JK Unlimited (4 door) Rubicon for a week in Hawaii.
http://www.expeditionportal.com/forum/showthread.php?t=33588
It might help give you a feel in real world use. I have spent a week with a 4 door, non Rubicon and another week with a 2 door, non Rubicon. Without question, I would own the 4 door as it rode better and had way more room inside for people and/or cargo. Down side it a little larger turning radius and a little more likely to rub the underside. The positives far outweigh the negatives in my view.
As for Rubicon or non Rubicon models, it really depends on what you are going to do. If you are mainly paved road with the occational dirt road, the non Rubicon model will work fine. It your plans include a fair amount of offroad, mud, rocky areas, etc. I would spring for the Rubicon without question. It will get you thru more areas then without the features. That said, it can also get you stuck further in if you are not careful.
Though I have never driven a Defender or G-Wagon, I love what they are and how they work, based on what I have read or talked to owners. In the end, my money would still be spent on the Jeep.
My views. Good luck on your decision.