My '98 fronty came with aluminum rims and it's predecessor had steel rims. I don't think there was much difference in weight. The aluminum ones might be a little lighter but they are much thicker in cross section and that adds a lot of mass. I don't think there is any real benefit to have aluminum for everyday use, though of course, they do look better and that counts for something.
Note: I bought an extra rim for each vehicle (junked the one-use tiny spare). The steel rim was $25, the fancy aluminum rim was $240. Some difference.
-tf
