EXP's are good tyres, but they life is not great, I got 3800 out of my first rear, and the second one is not likely to dfo any better - but should see of what's left on the front.
On the GS I switched from Deathwings (hated them) to EXP's (Good) to Roadsmarts (much better) and for road use road tyres are always gonne be better, and if your idea of "off-road" is a graded gravel track then they are still OK - ridden a few "unpaved roads" two up on a ZZR1400 (ZX14R) with Roadsmarts.
The wear was not massively better (about 15% more than EXP's) but they offered more grip both wet and dry and cost about the same.
When they came out Dunlop TR91's were well recieved by the press, and raved about by anyone who tried them - but much like EXP's did not last too well - and were still outgunned by the Roadsmarts on track tests (wet and dry)
I think the bottom line is for Road use fit premium sport touring Tyres (PR3 / Roadsmart 2's) if you really wanna go off road properly you need to ignore the Tourances / Trail Atacks / TR91's as in reality they are road tyres with deeper tread and wider grooves, they last no longer than road tyres and offer a shade less grip - but are fine and dandy if you don't like the look of road tyres on your ADV bike...
... I am not taking the piss either, the Roadsmarts on my GS looked quite out of place, so for my 99% road use I am either going to fit Roadsmart 2's for performance, or give up that last 5% of performance and fit TR91's to because they look better - if they do give an advantage on the simple tracks I may take to it is nothing but an added bonus.