I find that AEB triple shot give better results than built-in HDR. I did this experiment and used PS to combine the three images. The HDR looked washed out compared to the combined photos.
That being said...
If you brnig the HDR into PS and even do a simple "Auto" curves, it looks a lot better than the stock HDR. You also have one file as opposed to three. I may just be using HDR moving forward and adjusting the curves in PS.
My suggestion... set up your Phantom on a deck or something, don't even worry about flying it. Point it towards something and make sure you get some sky in the picture and don't move it (don't even worry about flying, jut set it up somewhere). Then take pictures using each of the modes, and do post where needed and compare for yourself. That's what did.