Depends upon your riding style and environment.
Any tread comprises a COMPROMISE. Think not entirely about what you GET in a tire choice, but also what you LOSE by making it. For example, generally, the more knobby, the better off-road performance, but . . . significantly lowered MILEAGE.
That said, keeping my riding style/environment/budget in mind, I have Heidenau K60 Scouts on my two front-line bikes.
Otherwise, I've found the Kenda K270 versatile and affordable (similar treads from other manufacturers exist). Even DOT knobby Kenda Trakmaster IIs are more versatile than one might think. "Big block" type treads? Most satisfactory, both on and off road, but . . . get ready to replace 'em soon. Pavement-biased "dual sport?" Continental Trail Attacks. (Have an unmounted pair of those in my custody; most affordable to a, "good home." CAVEAT: Shipping can be an economical killer.)
All this said: K270s are economical enough to try 'em and see if you like 'em, IMHO; everyone harbors his own tire opinion!
“You better put down that gun. You got two ways to go, put it down or use it. Even if you tie me, you’re gonna be dead.” "John Russell" (Paul Newman), Hombre