The Dorcy is probably a bit brighter with a much wider flood. The Sonic by design produces a narrow beam. Quality of construction is about the same with the Sonic getting the edge if any. Both operate the same with easy turning tail switches. The Dorcy has a momentary button.
I like both lights. The Sonic is more pocketable, but 2-3 times more expensive. However, I think it can be had for as little as $9.50 plus shipping from Texas Tactical Supply. My advice is buy both./ubbthreads/images/graemlins/yellowlaugh.gif
Geoff