Here's a link to a recent review with measurements and observations. I currently own 18 different LDCs including multi models of Huggett and DFLs. Donny's products have become the new benchmark for quality, performance, and price point. His customer service is unmatched in the industry.
I currently have both. Price and service nod goes to DonnyFL. Sound levels, very comparable, both do a great job. Aesthetically pleasing to the eye? The Huggett looks very nice on the Bobcat, very streamline. The Sumo from DonnyFL is a fine piece of craftsmanship. Can't go wrong with either, but if I had to only choose one? I would give DonnyFL sumo the nod.
I have experience with both, Donny’s Sumo and a Huggett Belita. A comparison in sound, the Sumo won, but not by much. Looks wise however, I stuck with the Huggett on my R3M. Also went with a standard Huggett on my Edgun 25 Long. Donny makes a damn fine product. I have his Edgun adapter on both to provide the 1/2 unf. Again he provides a great product and stands behind it.