Motoz
I've run quite a few Motoz tires over the last few years.
Desert H/T: Not my favorite of the bunch, but makes a good dual sport tire set. Good straight line traction in soft(er) conditions (aka DESERT) but didn't corner well at all offroad. On the flip side, it could hold a corner on the asphalt well enough to drag peg. Braking hard offroad= instant slide, you have to really get your weight over the rear and ease into the brakes to make it bite. Front tire is okay in harder terrain, but just doesn't seem to have enough "bite" in the turns and likes to step out on you a little on road (I'm use to the back letting go first, but not with these tires... understeer is a bit of a problem) Lasts a reasonably long time (I got ~1600 out of the rear.)
S/T: worst front tire I have ever run for ANY condition. I threw it away when it still had 80%+ tread. This made me lose all faith in their fronts as they all have similar patterns so I only use their rears now. Haven't tried the rear S/T.
X-circuit: I love the rear tire for all around riding, corners great in hard and soft conditions, straight line traction is great, lasts forever (1800 miles on one running it in the correct direction, 2500 miles on one running "backwards") I had an issue with the rear packing in sticky clay and snow so I tried running my 2nd one backwards. That did the trick and keeps the tread clean and still seems to pull just as well everywhere. I did notice that when running it backwards that it would tend to "drift" towards the downslope of any offcamber more than most tires. Braking is decent, but it still doesn't quite feel like a typical knobby, it wanders around when you brake hard with the tire mounted "normal" but stays pretty straight when the tire is mounted "backwards."
I/T: Just mounted a rear up about 200 miles ago and so far, so good. Has better straight line traction than the above listed tires, corners better in softer conditions than the x-circuit, doesn't pack in the mud that I've had it in so far, loud as $h!+ on road. Braking performance offroad is noticeably better than the x-circuit and more inline with what I expect from a typical knobby. I would say that it does not feel any better than the x-circuit in hard conditions. It still manages to hold a corner on the asphalt well enough for me to get me in trouble with the law, but not as good as the x-circuit or the H/T... still better than any other knobbies I've used over the years. If this can last 1500+ miles, it will be my new "go-to" on my dual sport, if not, I will keep buying the x-circuit and never look back.
Keep in mind that all of these were run on a KTM690 (65+ HP, 329lbs wet, ready to ride) using 130/90/18 rears and ridden like a real dirtbike, not the "old man dualsport" that most seem to use it for. On the GasGas the only one of the bunch that I would consider would be the I/T or S/T rear.