I was thinking about adamant or impish but I'm not sure witch will be better, please post all ideas, I don't mean this to me a opinionated question because I'm sure one is better.
If you are going for a physical sweeper then I would definitely go with Adamant. Give him EVs in Atk and HP, and he will serve well.
Adamant is the better choice if you are going for an attacker set.
Impish if you want more of a defensive set but I dont understand why you would when Scizor is more designed for Attack.