My – that's helpful MarkD. I'm guessing you don't sell 29'er stuff?
Ardent is good, fast rolling and cushy. Good on most stuff inc rocks and roots, but suffers in gloop as the tread isn't deep enough, though it does clear quite well. Crossmark is fantastic on rear and suits the same conditions as the Ardent. Bonty Mud-X is great in gloop, though I run a Rampage on the front in gloop as my bikes are mostly rigid, and the mud-X is too wee on the front for comfort and traction in sketchy sections.
The new Bonty FR3 looks interesting as a ft tyre – big and aggro cornering lugs – might pair up well with a Crossmark on the rear…..
Having said all that, I mostly can't be arsed changing tyres, so stuck with Ardent/Crossmark at Strathpuffer. Fair to say that there was a fair range of conditions, and they i don't think I could have picked a better compromise even if I'd bothered…. The long contact patch broadens a given tread design's application range.