What's the advantage of a angled diptube?
"If you ever reach total enlightenment while drinking beer, I bet it makes beer shoot out your nose."
-Deep Thought, Jack Handy
"Brewers enjoy working to make beer as much as drinking beer instead of working."
They are bent so they fit into the dimple, centered in the bottom of the keg.
there are a couple types of kegs. some of them were designed for a bent tube and have the dimple in the center. others have the straight tube and have the dimple on the "side". No advantage, just different design