Here are some numbers:
Annual pass - $904.10
9 day park hopper - $543.15
6 day park hopper - $511.20
total tickets for two
free dining trips - $1,054.35
Annual pass cost $150.25 less than tickets - and they have additional benefits, such as free memory maker and resort, restaurant and merchandise discounts of 10%
The value of the qs dining plan for six days, one person is $314.97. So if you subtract what you would have saved by buying the AP, then your "free dining" is worth $164.72 per person or $329.44 for the two of you for your November trip. Additional discounts from the Annual Pass over the course of the two trips could easily make up for the price difference. For example, dinner at Ohana for 4 adults would be approximately $180. But if you had an AP then the cost would be $162. A resort discount of 10% for a value resort would add to the benefits.
If you think you will be going to WDW a third time, before your annual pass would expire, then I would definitely buy the AP. They are very addictive and it becomes very easy to return to Disney again and agin.