JP plopping a mIC in FIC is a given for basically any game.
Your second/potential third/rare fourth mIC, and the order in which you do them, depends on a few major factors and a half dozen more minor but still important ones. If you give me a style of game or a map layout or a savegame then I could offer my humble take on the matter.
Without any context, in general: I love Manchuria if the plan is to pick on Russia, and it also potentially messes up an American landing in Korea if you leave SZ 6 exposed. More often than that, though, at least for me, Kwangtung and/or Malaya are great for a variety of different and similar reasons, and doing both sometimes, but by no means always, can also be pretty damn great. Shangtung I’d do least often, but it has its merits for certain situations.
edit-
wurdz spellings is hard