I would go for the XZYs. They are more of a general purpose tyre they are very tough, and will last the distance. Although they are rated 12 ply, this relates to their load carrying ability, not their construction. The side walls are quite flexible if you need to get them off the rim to repair punctures etc.
I have also used the XZL's - they are good in mud, but the side walls seem quite vunerable to damage, as sticks etc can catch on the raised sections and penetrate the tyre, and not just slide along the side of the tyre.
Cheers,
Andy
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