pros: you don't have to build it, great customer support, it's gonna rock right out of the box. Much prettier than a UDS.
cons: The 18" diameter kinda sucks sometimes... It costs $200.
UDS: (this is coming from a guy who does not own a UDS... only read about them a lot)
pros: Cheap to build. Higher capacity (if you build two racks). Seems to get longer burn times. Apparently they are a Q microwave so your cook times may be quicker.
cons: They're ugly. If you need to refuel during an extra long cook it may be difficult.
"Yeah, but bacon tastes gooood. Pork chops taste gooood" -Pulp Fiction
Weber Smokey Mountain
Weber 22.5" One Touch Silver
Charbroil Silver Smoker w/ mods (never used anymore)