Here is one difference. My Mini has no gps but the SE does. I can set up a mission on the MIni while at home and connected to the internet, then go out and fly it and it works near perfect for standard missions.... waypoints, orbits, zips, etc. BUT if I try to use it to do a "follow me" type mission, it is not very accurate. The camera may not point just right, and the AC may wander a small amount. Using the SE for the same "follow me" type mission results in a near perfect mission every time. The DJI program fails on a "follow me" mission if there is any obstruction between the target and the AC because the DJI program seems to rely heavily on the visual image of the target. (To be fair to DJI, I was using the "operator" as the target in the AP missions...so the AC was following the device, not an image.)