No such thing as a perfect all round tyre, but cost aside, Conti Black Chilli UST Rubber Queens in 2.2″ come about as close to perfect as you can get. I’ve ridden just about every tyre mentioned in this thread so far before, only the Maxxis Minion and HR can rival them for grip, but in turn they drag more and wear out faster.
Very expensive, but very very good…
Currently using 62a compound Maxxis Medusa’s as a winter tyre on my hardtail. They’re much quicker rolling than a Bontrager Mud X, clear even better, grip very nearly as well in the deep mud but as well or better elsewhere, and being the LUST version they seal tubeless without any faff. Very impressed with them (cheap from On One too) and are now a default selection for winter.