a14 performs a little better in terms of cooling and noise (in terms of db) than the p14. however, the sound that the a14 makes isn't as smooth as the p14 imo. you probably won't notice any of this
ultimately, the only differences that matter are the color and the pricing. when you pay the premium price for the standard fans, you receive screws, anti-vibration mounts, silicone pegs, cable extension, y splitter, and low-noise adapter along with the fan. the redux line only gives you the fan and 4 screws