I'll tell you that the worst "tacky" grip is Pacific X Tack Pro. It's a strange overgrip in general, extremely wide and very stiff. Thee is little feel to begin with, and the comfort dies extremely fast, along with the durability. It only lasted me 2 hours before any decent comfort and tack was gone. Very disappointing.
Wilso Pro and Yonex Supergrap are the most reliably tacky and absorbent. Not the best in either class, but the best mixture of both.
Wilson Prostaff RF97 strung w/ Nat gut mains @ 58lbs & Lux ALU rough crosses @ 54lbs