Photoscan has a neat feature that Pix4d does not have at the moment. The ability to export the calculated cameras as a .fbx file.
This is really useful for visualisation work, as it makes mixing photos and 3d renders a lot easier. If you want to make a render showing a proposed building or something, and mix it with a drone image of the current terrain, all you need to do is take the image you are going to use, and then take a few more, enough for calculations to work, and then the camera and image that was taken at that position will line up perfectly in 3d software.
It’s a shame that there is no such export at the moment, since all the required info is there allready