Flights less expensive in Nov or Feb?

[stefanospops]

I have two trips planned for WDW soon. The first is Nov 28-Dec11 and the second is Feb 25 to Mar5. I have enough miles to fly for free on one of these trips (Buffalo-Orlando or Toronto-Orlando) and am wondering if people know which of these dates is likely to have less expensive flights so I can book the miles for the more expensive period. Any suggestions?