Makes a pretty good case for steel even if you're not planning on difficult trails.Weight is important. So is durability. Based on the appearance of his skids, the guy who did this review is obviously more hard-core than I am (and probably most others too), but he prefers steel. He does say that everyone has to make their own decision based on the kind of driving they do and their own preferences.
(2) Aluminum VS Steel skid plates - Real world reviews - YouTube