I would base my decision on what would be most convenient. If you have a non-park day and can do CM then you will see Mickey, Minnie, Goofy, Chip & Dale and maybe Donald Duck. Then you can hit toontown or AK and wait in line for the Pooh characters. If you would rather then do the CP and see the Pooh characters and wait the line for Mickey.
IMHO the line for MM is always soooo long that if meeting characters is most important I would do CM and get Mickey and Minnie "met" and then stand the line for the Pooh Characters as the line dosen't get as long. Hit toon town 1st thing and head to the tent and you should not have much of a wait. Otherwise wait until parade time or very late in the day.
TJ