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Notice where the cable attachment points are from the cables. This will affect where the stress is put on your chest. 

Cable Attachment Point - High = Decline Cable Fly

Cable Attachment Point - Middle = Flat Cable Fly

Cable Attachment Point - Low = Incline Cable Fly

0:00-0:44 - Standing Flat Cable Fly

0:45-0:59 - Standing Incline Cable Fly  
1:00 - 1:20 - Standing Decline Cable Fly

1:21-1:31 - Sitting Flat Cable Fly
1:32-1:42 - Sitting Incline Cable Fly
1:43-1:54 - Sitting Decline Cable Fly

1:55-3:03 - How not to do cable flys