Half the fun of BF is a food fight, . Seriously I think that the two "premium" options, IGH vs a high quality derailleur system have been well discussed and argued.

The problem for tourists is that the existing off the shelf derailleur based systems are becoming somewhat more difficult to piece together. Campy never cared much for touring groups. SRAM is doing a nice job of pushing the envelope on big cassettes and simplified gearing up front but I think that tourists will continue to stick with triples. That leaves Shimano. You can piece together a pretty good system using Shimano stuff but it is not as simple as it used to be when road and mtb stuff was fairly interchangeable.