Lifting Shadows is my favorite ballad, though Beneath the Surface is close.
The first one I find to be quite emotional and just an amazing musical journey. The song builds up super nice and smooth from one section to the other until it reaches that climax almost at the end of the song, just to go back to where it began. On top of that, the contrast between the chorus and the verses is just perfect. It is a great example of what I love about early DT.
Beneath the Surface on the other hand, is much more concise, but nonetheless a beautiful piece of music. Everything about this song brings me peace and quiet. The string arrangement is a fantastic detail that adds an interesting layer to the song. I feel the song would still be quite good without it, but that puts it above other beautiful songs they've done in the past.