Fins.

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[I think] Square fins will usually put more drag in rear of rocket so actually be at least as stable (maybe a little more so). Only performance benefit or rounding / airfoiling of fins is increased altitude as a result of less drag. I like to round the edge of fins since it takes off rough edges from my CNC and makes them look more finished.
 
I used to airfoil fins but I noticed that over time the edges would get nicked and start to look bad so these days I use the round profile.
 
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