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Be advised: If you plan on using the optional custom transmission tuning feature it will void the power-train warranty on the Cortex, leaving you with in essence a 3865, so if this is a plan, just save the $ and get the 3865...
OK cool. So it looks like both have an optional transmission tune piece that can be purchased. It really comes down to paying a bit extra for a warranty on the Cortex (which goes away if you do the tranny tune).
Well, I paid the extra money for a gray/Silver tuner that IMO looks MUCH better than the red 3865, the cortex matches the interior better and plus I'm not a fan of red either...
Also, the cortex is compatible with a bunch of Chrysler vehicles as compared to the 3865 is only for the Ram I believe. This means you can try the Cortex on your other Chrysler vehicles AND when you sell it, you have a better sellers market. Just a thought.