I have them both. I haven't been able, notwithstanding all conceivable efforts, to find Energizer DB replacement bulbs here in Europe, while is rather easy to get a PT replacement lamp assembly.
There is no comparison between DB AAA and PT Rage. The PT is smaller, brighter, has a good beam, and can withstand many abuses, while the Energizer DB may suffer even from a drop to the floor.
The only advantage of the DB over the PT is the longer runtime.
Anthony