I forgot to answer the OP's question!
My feeling about it is that I love both concierge lounges but for different reasons. We've had the best service at DLH lounge and I like the view. Love their homemade potato chips!! However, I prefer the GCH concierge lounge because I like the setup better (I find it easier to use and prefer the seating) and IMO the food offerings are far better. DLH doesn't offer much midday, whereas GCH has little sandwiches, scones, etc so you can make a whole luncheon out of it. *Here is a tip about DLH for that, though: they have great bagels, cheese, lunch meats and fruit at breakfast, so make yourselves sandwiches for later.