I've not tried the DRZ off road but the XT is a heavy bike to use. I went off road last Sunday and found whilst it coped with most lanes it really had a problem with the pebbly type lanes specially if they were submerged in mud.

You will 100% have to change the tyres as the standard are far from ok in wet conditions off road, if you need a set check out the for sale section got the conti's off mine with less that 200 miles up for sale, open to offers if your willing to collect or arrange collection.

Tiny