I've been looking at adding a drop bar MTB to the stable, and of course, the obvious choice is the Fargo. Looking at the geo specs between the Fargo and Deadwood, it is almost exactly the same, except 1deg slacker HTA, longer WB. Surprised to see BB drop is the same, but guess Salsa expects people to take the DW through rougher terrain. This is good news for me, since I like smaller tires better.
Not sure if you're able to answer this, but what I'd like to find out is how the two compare given the same 29x2.4" tires. I'm not interested in a 29+ platform, as I've got a bike already that can handle that (and have been set up as such), but for my type of riding, the sweet spot is 2.4" tires. (If I need fatter, I'll take my Blackborow.) My thinking is that the DW would be much more fun downhill and in the techy sections. I can't think that either would have an advantage on the flats. So point to the DW.
What I don't like is this boost 148 crap (I understand the theory behind it, but at my weight, no advantage to me). I have a few accessories, and in particular, my Chariot trailer that I use to tow my kids around in at times. Sure would be nice to just use the stuff I've got now (not sure if they even make 148 TA adapters). This is a point to the Fargo.
I'm leaning towards the Fargo, as it would fit my needs for a backcountry bikepacker. The DW's appeal is the added DH prowess. Something I'd want, but not a need.