I'm certainly not an expert and couldn't tell you much of the differences; however, I love my Backwoods Fatboy. It holds temps great and turns out amazing Que. I almost feel guilty using it because it's so easy.
That said, I've never met someone who owned either a Spicewine or a Backwoods that that much negative to say about their smokers. You can't go wrong with either one.
Klose 24x50 BYC
Rock Chalk Jayhawk Blue Thermapen
Weber Gasser (out of gas)