Generally speaking, the only time to use Quick Claw is when you're playing with Item Clause on and you've run out of other options. If you've got something with Leftovers, something with a Choice Band, something with a Salac Berry, and something with a Lum Berry, it's pretty much down to Quick Claw, Brightpowder, maybe Leppa Berry in certain situations (e.g. you're using a 5 PP move while playing against ubers, who usually have Pressure), White Herb in rare situations (Overheat, Curse + Baton Pass combo, paranoia about Intimidate), and... yeah.