Howdy, neighbor!
I live in the northeast Valley. And no, I really don't talk that way!
How long will you be in Orlando/WDW?
If you will be there five full days, I definitely would go with the five-day PH if budget permits.
Each park deserves the potential of a full day. Realistically, you're going to enjoy some parks more than others. AK closes earliest, so it's possible to go on to one of the other parks for the evening after leaving there.
How long you spend in each park depends on your family or group and their interests. Personally, MK is 1 to 2 day park, EPCOT is a 2 day park, MGM is almost a full day, and AK (in cooler weather, such as December) is almost a full day.
If you're flying Southwest and take the early morning flight from PHX to MCO in December, you'll arrive at MCO around 3:30 p.m., and actually be checked in at your resort (direct transport, no stops) around 5:00 p.m. That gives you an evening for DTD or the Boardwalk--or anything else you might like to do. Just don't make a PS for that night--just in case!
If you haven't already booked your flights, try to avoid the return flight (around 4 p.m.?) that requires changing planes in Albuquerque. The transfer plane is always packed, and those boarding at ABQ have no choice in seating!
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Taja