There are places for both items:
CHOICE SCARF: If you don't have any kind of priority nor Sticky Web support, the Choice Scarf is the way to go or ya'll can say siyonara against a Weavile. The only drawback is after you use a Dragon/Ground-type attack, Togekiss can switch-in, forcing you to switch-out, and it gets a free Nasty Plot. OR, something can switch-in and resist and attack, forcing you to switch-out, and it gets a free stat boost.
CHOICE BAND: If you have anything like a 3x Baton Pass from Scolepede's Speed Boost or Sticky Wed, then it's time to boost those EQs and Dragon Claws. Same drawbacks as the SCARF.
Hope this helps!