Alan
My comp teammate and I recently picked up two Superios Smokers SS-2's (veritcals). I was wanting a new smoker and I looked at a LOT of cookers, Klose, Gator, Pits by JJ, Horizon, Yoder, Stumps, Superior, DW Kountry Cookers, etc.
My choice was veritcal - less fuel consumption, less baby sitting, insulated (I fired it up here in KC in 7 degrees yesterday with half a chimney of briquettes, was at 300 in an hour), and can have a stoker / guru placed on it pretty eash to mind temps.
For the vertical, they're three main manufacturers, Stumps, Superior and DW Kountry Cookers. There is history between the three owners, and a lot of people could chime in on it, but there were reasons we chose Superior. First was having the firebox on the back vs. the side - this lets the door open all the way vs. stoping half way on a Stumps. Second, space between shelves. Stumps runs 3 inch spacing, Superior is closer to 5-6. Big difference getting things in and off shelves. Third, we really like the removeable grease deflector and how its setup.
Let me know if you've got any question, I'll be happy to answer them