They are all different and
useful space savers.
Not exact matches
Additionally, even if your goal happens to be short flights on American Airlines within the U.S., AA has sharply reduced their
saver award
space (which is the
space open to partners such as British Airways) so Avios are less
useful for those awards.
While Delta SkyMiles can be tough to use for booking award flights to Australia because of incredibly high redemption rates, your miles can be
useful if you find
saver level award
space.
Additionally, even if your goal happens to be short flights on American Airlines within the U.S., AA has sharply reduced their
saver award
space (which is the
space open to partners such as British Airways) so Avios are less
useful for those awards.