There is no magic tire that works on wet dirt/roots and roads too.ChrisFFTA said:
If you alternate trails and roads a lot, it would make sense to pick up a spare pair of wheels, so you can switch them quickly for the ride you're doing (then you can have more specific tires mounted).
Blue Groove (sticky) on the front, Nevegal DTC rear, might be a combo that will be ok on the road, and very good on the trail conditions you describe (as long as it's not heavy mud). I say DTC rear because sticky rubber on the rear won't last with some road riding.