I had the OEM Bridgstones, crap in the cold and wet. Then had Tourance Next on it, very good but I found them a bit dodgy on uneven surfaces, they tended to track into ruts and overbanding, needing a solid input to 'pull' the bike back onto line. I've got Conti Trail Attack 2 on mine now, and they have been bloody brilliant. Grippy and stable, giving me so much confidence, I've had two holidays in the Highlands on them so far and had the most fun I've ever had on the bike, absolutely superb tyres.
Course, you'll get 20 replies and have 20 different tyres recommended to you - but you did ask!