I use both, but just like a lot of other people in this thread, I use them for different purposes. I NEVER store LME. I always have DME on hand in case I want need to use some malt extract for something other than a core part of a beer recipe. When fresh, LME is a lot better than DME in my opinion and I only buy fresh LME and always use it within a month of buying it so it can't go bad.
The most recent beer I made was a mixture of two different types of LME and two different types of DME, not to mention some maltodextrin, so I obviously don't have anything against DME. But if you have to go with only one or the other, my vote would be for (fresh) LME.