When an article is submitted to a conference or journal, is it better to use British or American spelling? Does it have to be according to the conference or journal's style (based on where it is being held or who hold it) or is it up to the writer to choose and stick to one style?
When I write papers, I usually try to write in American English. I say try because not being a native speaker (I'm Belgian), i have a natural tendency to mix up stuff. So when I'm not sure, I take a dictionary and look up the possible spellings and will settle for a consistent choice, which is most of the time American English.
The most important is to be consistent.