I have had my Edlinger for more than 5 years now and it is still going strong. I recently bought my second Edlinger and have retired my first one to top-roping purely because of it's age and for piece of mind, although physically the rope is still in really good shape.
Take a look at the number of fall factors that each rope offers you and decide whether you are going to pay the extra cash for the extra fall factors, keeping in mind that doing sport climbing, unless you are really going to push yourself, your rope is rarely going to see a full fall factor
Beal has a nice in-depth article on fall factors
::here::If you own a Grigri, I have been warned to steer away from the thinner ropes, especially the Edlinger as it has some form of protective coating which causes it to slip through the device. The coating does wear off over time and the rope becomes really nice and flexible. For normal ATC's it works really well.
If the extra cash is going to give you more piece-of-mind, go for the more expensive one.