Scizor does have these two combinations (Technician + Bullet Punch), which is why it is such a popular Pokémon in competitive play. However, looking away from those facts, seeing Scyther alone it puts up a decent fight with decent stats and moves at its procession. I myself would use Scizor over Scyther in competitive battling. Though, if it were just through personal preference and an individualistic strategy then Scyther wins me over.^Scizor also has technician....paired along with bullet punch, etc. makes it amazing.
Scizor has my vote.