Nichwell Have you seen the bike comparison chart on page 22 of the Thorn touring bike bible?
The chart gives a good idea of how the bikes in different configurations, perform for a variety of different tasks.
I would try and get decent length test rides on them both to see how you feel about them and the Rohloff.
I have tried and failed to get a bike that will do everything well, I also do some Audax type rides, some commuting and some laden touring.
Two out of three is the best I have managed.
I finally settled on one heavier duty flat bar Rohloff machine for year round commuting, utility riding and laden touring. The bike is set up with fat reasonably puncture resistant tyres, discs front and rear, dynamo, mudguards, rack, Chainglider. It's tough enough to stand the daily commute or reasonably heavyweight touring over a variety of different surfaces. I do more miles on this machine than my other and it is very low maintenance. It's probably most similar to a 650B disc Nomad.
It's great, but it is a bit of a tank and I found it too slow for longer more sporty rides. I find myself very quickly dropped in a group ride! Not ideal for a longer audax on good roads.
My other bike is a drop bar Thorn Club Tour with the 853 fork. 30 speed derailleur gearing. This is much lighter, no rack, lighter, narrower road tyres and mudguards. I use this mostly in the summer months for faster day rides unloaded, or lightweight single night B&B trips with a decent sized saddlebag. Its much more engaging and responsive to ride. Because it's only really used in dryer conditions and for less miles, I can live with the level of maintenance required to keep everything running nicely.
I did have the Club tour setup with a Rohloff and a chain tensioner for a while. Whilst it worked OK, I found the gear change with drop bars and the rohloff more awkward than with STI shifters. I also found that as you can't change gear under heavy load with the rohloff I ended uo being a bit slower overall, if the route had a lot of climbing.
In short I find the Rohloff great for heavier touring and doing the day to day utility type riding. The low maintenance is a big plus. But for faster rides I still prefer the drop bar derailleur bike.
As both bikes were bought second hand, I made a significant saving on buying new. The total cost for both, was a lot less than a single new Nomad or Mercury.