My workshop experience of Sram generally is not great – wears quick, spares cost loads.
I would agree with al. Double Tap actually works really well when it’s fresh out of the box (and I HATE SRAM gears on MTB’s), but it definitely tends to go out of whack much quicker than Shimano, it’s WAY more dependent on good quality gear cables with a lag free run to work well, and spare parts are horrifically expensive! Set of Apex STI’s at RRP is nigh on as much as Merlin are selling an entire groupset for right now for instance.
Even Tiagra is good these days, got some on the winter bike and it’s solid stuff. Not that much cheaper than 105 though.
Tiagra looks more agricultural, but by god it’s good for the price!
Now, double, or Tripple, or MTB C/set?
What size tyres you going to be running, and are you ever going to load up? For the kind of bike the Fargo is, I’d probably go for a Triple with a 12-30 cassette to give you a 1:1 bottom gear for the odd occasion it might be needed. However, if you’re going to be loading up at all, get a long cage MTB mech on there with an 11-34 and a 26/36/48 touring chainset on there!