The Uniden SDS100 and 200 radios are a culmination of Uniden's decages long developement of scanning radios, thanks to Paul Opitz. They are excellent radios and I have both and I believe they continue to sell quite well. However, from a business standpoint I cannot see Uniden dumping more capital into R & D for an extremely niche oriented market that unfortunately is dwindling due to technological advances in communications.
Unication, on the other hand, had a substantial market for their products in public safety, etc., and sort of stumbled into an
entirely new hobby related revenue stream. Unlike Uniden, they see some upside potential here, and are slowly expanding the capablities of their radios to behave more like "scanners" in many ways, while I assume they are skirting around the patent restrictions on the scanning technology I believe still owned by Uniden. Unication continually updates firmware while Uniden does not. That speaks volumes.
As a base unit the SDS200 is simply marvelous. No receivers of that nature come anywhere close in my opinion. Focusing on portables, however, something you are going to carry, the SDS100 is a Swiss Army knife while the Unications are fine tuned blades. I do not know why Uniden continues to produce such wide banded radios, brining all the problems that entails, when most of the listening is confined to specific bands. And that's where the Unication shines.
If you do not need all of the coverage offered on the SDS100, and what you need to monitor in your area is active on what the Unications offer, I would go with the Unication hands down. Solid, pro grade crystal clear reception across the board.