Knock Off seems like the best move unless your team benefits more from Flying coverage from Scizor. Knock Off is a spammable move since even if it's resisted, most Pokemon take a loss if they lose their item.
If you insist otherwise, I suggest Aerial Ace over Acrobatics, as it has a 60 Base Power, still boosted by Technician. Acrobatics will only ever out damage Aerial Ace if Scizor has no item (which is reasonable if your opponent has multiple Knock Off mons), but even then, that seems situational enough that the ~10BP difference with the Band is more worth your time.
252+ Atk Choice Band Technician Scizor Acrobatics (55 BP) vs. 252 HP / 0 Def Conkeldurr: 308-364 (74.3 - 87.9%) -- guaranteed 2HKO
252+ Atk Scizor Acrobatics (110 BP) vs. 252 HP / 0 Def Conkeldurr: 276-326 (66.6 - 78.7%) -- guaranteed 2HKO
252+ Atk Choice Band Technician Scizor Aerial Ace vs. 252 HP / 0 Def Conkeldurr: 338-398 (81.6 - 96.1%) -- guaranteed 2HKO
252+ Atk Technician Scizor Aerial Ace vs. 252 HP / 0 Def Conkeldurr: 226-266 (54.5 - 64.2%) -- guaranteed 2HKO
With the band, Scizor can manage a rare OHKO with SR, but Conk has a safe margin no matter the situation with Acrobatics.
All that said, I still recommend Knock Off for being spammable.