My Scorpion Trails did not last 8000Km. When new they gripped dirt well but quickly wore. The Michelin PR
2s lasted longer and wore more evenly due to dual compound rubber, it's harder in the center and softer on the sides. They also grip pavement slightly better wet or dry. I would look at the Michelin PR
3's if you want the ultimate wet traction. Any tire that claims dual sport capability will not grip pavement as well as a sport tour tire. No matter which way you look at it, there is always a trade off that goes both ways, when it comes to off road/on road tire performance.
Apparently the just released, Metzler Touranace Next is the top rated 95/5% adventure tour tire from magazine review I just read. The rear, not the front, Tourance Next, is also a dual compound tire unlike the Scorpion. Both the front and rear tires in the Pilot Road series are dual compound. The Pilot Road series is a sport tour tire though, not an adventure tour tire. As long as you don't want to hustle down a dirt road I would go with a sport tour tire. They work fine at lower speeds on graded dirt roads.
Not sure you can still buy Michelin Pilot Road 2's any more. Michelin just released the Pilot Road 4's and have discontinued the PR
2's. I currently have the PR3's they have similar dry grip to the PR
2's but wet traction seems much better under hard braking. They say they also last slightly longer although I have not had mine long enough to find this out. The slight extra cost of the Michelins has more than made up buy increased life expectancy in my case. My PR
3's currently have more miles on them than I was able to ride the Scorpions for and they have lots of life left in them.