Looking at booking 787 premium economy award. Both DFW and LAX has Classic award availabilty on my date. What are the pros and cons of departing one or the other location? Travel will be during peak Christmas holidays.

My other option is to fly Singapore Air business from IAH-MAN-SIN-SYD. The only reason, I haven't jump on that yet is the 54 hours total travel time because of a 24 hour layover in Singapore