My personal preference all around is a TKC80 on the front and a MEFO on the rear (or a 908 on the rear if I'm doing a longer, offroad bias'd trip).
70/30 dirt to street = 908 rear
50/50 dirt to street = mefo rear
I've tried "dirtier" tires on the front (T63 for example) and keep returning to the TKC front - it just works well enough onroad and offroad that I use it and don't sweat it. I do like the 606 on the front when it is new.. but I'm not a fan of them once they start to wear; the 1-2-1 pattern tends to cup the second rows.
I'm a "steer with the back end" type rider and I find both of these spin up and go sideways predictably for cornering offroad. None of them last long enough because of this but this is the reason I don't run a TKC in the rear... I can make it go away in a weekend and they aren't cheap.
I don't have suggestions for primarily pavement as imho pavement is just a necessary evil to get to the good stuff... but my understanding is that those who ride more pavement than dirt tend to like the scorps?
Hope this helps.