different stylebooks and manuals (i.e. chicago's, associated's, etc.) will always have a preference of one or the other, but all of the ones i listed have dual spellings that are accepted by all dictionaries i've read (merriam-webster's, oxford english, american heritage). stylebooks are more decisive, as they are manuals of style. but i think the brits should stop fucking with english and leave the french spellings to stay in french.