We also have young kids and normally my vote would be AK hands down... You can certainly rush thru AK and do all the “attractions” in one day but on our last trip we spent an extra day in Ak just to explore all of the trails, streetshows and animal exhibits scattered around the tree of life and oasis. Ak at night is also neat and more kid centered in my opinion...
However since you will be there in november if the festival of the holidays is going you should experience that... esp the candlelight processional, holiday food stands, and the epcot holiday fireworks ...great atmosphere definitely worth it also pick epcot if you want more table service dining options AK has fewer options for table service but their QS is excellent
Last suggestion, leave it open for flexibility and ask your family where they want to return after visiting both, true some fp options may not be available so book the most popular ones on your first day in each park, and if you miss a must do in either park you have flexibility... you know your family best have a great time!