Which drop-bar shifters (105 or Force) for long distance bikepacking / loaded touring

Which drop-bar shifters (and group) do you recommend for long distance bikepacking / loaded touring? Shimano 105 ST-5700 vs SRAM Force. I have the opportunity to get either group for about the same price. So far, I have been all Shimano on my road and CX bikes, but have heard that some folks love the SRAM doubletap shifters. In either case I would be using them with a compatible MTB rear derailleur (XT or X-9).