Well, my Dell is older (I got it to run OS X). New laptops I've looked at to get seem like ASUS always has better specs, less configurations (great for driver updating), even a better WEI.
I think with Dell there are 2 things- 1. You are paying for the service they provide which I hear is good (but if you have good hardware to begin with, and loads of knowledge, why do you need good service?) 2. They have been branded sooo long, that you are paying for that name and the 'history' or 'longevity' it provides. As an analogy, compare Levi's to an off brand you get at Ross. You wear Levi's, people know it cause of the distinctive tags or looks. Or Carhart or whatever 'well known' brand is. You are then in the current cliche (like when everyone had to have Swatches with Calvin Kleins back in my teenage years!!)