My Blaziken's current moveset is
- Low Kick
- Peck
- Heat Wave (my only ranged move)
- Slash/Quick Attack
On one hand, Slash is more powerful, and hasn't been leveled up as much (more potential for further power/PP increase), has higher PP (25) and also has high crit-rate
On the other, Quick Attack has better range, so I don't have to waste Heat Wave in corridors, but it's been leveled up quite a bit (it currently has 17PP and approximately 2/3 the power of Slash)