Metal mags generally (in my experience) are more tunable as you can bend the feed lips to change the height of the round in the mag and ease feeding. The plastic mags can be filed and you may get lucky and have it work great with or without adjustment, but if you file it to far that's it! Buying 1 AICS or Accurate mag may be better than 2 Plastic mags!
On another note I have not messed with the poly mags because of my feelings stated above, but that was one of my biggest issues in getting the Savage action to feed and cycle reliably from a magazine. It is also possible to file down the mag release if the magazine is sitting too high, but again there may be some tuning/fitting to get all the parts to work together.
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