I can't think of any advantages, and only one disadvantage to going Commercial over a Mil-Spec buffer tube. A Commercial tube's threads won't fully engage the internal threads on the lower. There should be plenty to chose from in either category though not all companies make both commercial and mil-spec stocks.
Add: At first I used to favor the commercial tubes as their greater diameter would seem to be stiffer than mil-spec but I've since changed.
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