Been lots of threads on this topic, search around. Generally a matter of personal preference/ride style.
I just re-purchased the same tires I've been using happily for the last 2 years, but I'm not overly concerned about rolling resistance and I don't change em up till they are dead:
2.35 Stick-E Kenda Blue Groove Front
2.1 DTC Kenda Nevagal Rear
Schwalbe Big Betty/Fat Albert
WTB Moto/Mutano Raptor
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