Question: Why are you using unevolved's?
Anyway, if you go with Scyther, give it Eviolite. Scyther is no worse than Scizor...while Scizor is actually more competitive, its not a huge gap, like (clearly) fully evolved high-stats Lucario over low stats Riolu.
In fact, both Scyther and Scizor have the exact same base stats. When Scyther evolves, its true base stats DON'T increase like any other Pokémon do upon evolving...Scyther's stats just get distributed. Scizor gains a higher Def and a slightly Atk, losing Speed compared to Scyther. While Scyther's stats stay as higher Speed, high Atk, etc., meaning their stats total are the same.
So yeah, Scyther is totally a valid choice.