The only real difference between the Advance and the Professional is the resolution they can grab videos, as you probably already know having read all the posts. P3A is limited to fullhd video, P3P arrives at 4k.
I don't own a 4k tv, so P3P is almost a waste for me.
Additionally, I don't have enough powerful hardware to handle or edit 4k videos.
And if you're into photography (as I am), you don't need video at all.
That said, IF you have the money, go for P3P.
Sooner or later you will buy a 4k tv (as I will probably do), sooner or later your pc will have enough power to handle 4k video streams in real time.
I reamember my first digital camera, it was 3megapixels and looked too much for me. Editing the still pictures used to take ages. Now I think it's a shame I am missing higher resolution of some pictures I took.
And last but not least... you can grab screenshot of your 4k video stream and have a quite decent picture as well. This partially solves the issue (it's an issue for me) that you can't take pictures while you are filming (you have to stop filming, take the picture and start filming again).
Of course the P3P costs more.
I simply couldn't afford it.