I notice that one of your goals is a trip to Hawaii. All things being equal (which they seldom are) I would go with American. In 20 years I have had 100% success in getting standard awards to Honolulu or Maui for the most convenient flights that I want. This is out of New York so it should be similar to Boston. In the past 10 years I have NOT been able, period, to do so with Delta, Continental, or Northwest.