print() vs sys.stdout.write(): which and why?

I have a script that creates output with sys.stdout.write() and sys.stderr.write(). Recently I've posted a couple questions about other aspects of the script and I've noticed that people posting answers seem to prefer print('some text', file=sys.stdout). My primary concern with the output is simply that it can be piped by the shell, either into a file or as input to another program. Can someone please explain (or direct me to an existing explanation) the differences between print() and sys.stdout.write, the cases in which each should be used and the rational for those conventions?