I have stayed at the skyline and Hilton, as I am gold in both programmes. I prefer the convienience of the Hilton, and very much like the lounge and the Zen restaurant, which is very reasonably priced. The skyline is much better now it has a lounge, and I generally get an upgrade. As mentioned its a bit noisy on fridays and saturdaysm but hey this has its benefits

It its an early flight or you need sleep the Hilton would win, otherwise go for the Skyline.