DJI says that the camera is the
biggest difference, but one of those big differences is the video downlink bandwidth.
For some reason, the much lower bit rate of the P3A is not talked about very much. I can only speculate why it's not discussed much. Perhaps people don't notice as much when not using goggles so it's not a big deal to them. Perhaps they see the settable custom transmission rates on the channel select screen, but they don't realize the P3A has a 2Mbps max no matter the setting. Also, maybe some people just don't mind the issues seen with the lower P3A bit rate. Regardless, the fact is that the P3A has a much lower quality video down link than the P3P.
I just think it's important for P3A owners (or potential P3A owners) to understand this and consider the pros and cons before they decide to spend for the HDMI module and goggles. A more informed decision means they are less likely to be surprised if they are disappointed by the image quality.
Compare the Phantom Series | DJI
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