6P has better speaker(s), better looking software (IMO) and a 128GB option.
N5 has a better video camera.
I don't think there is much of a performance gap is there?
Personally, the Note 5 speaker is actually very good. Yes, 6P's are slightly better, but it's not a huge difference. With Material Design theme applied, they look the same. As said in the video, Samsung does have some useful software (eg the camera app is better). I have a 64GB Note 5 and that's probably actually about 20-30GB more than I need.
N5 video is way better IMO, based on OIS. Also, the 6P is just a little too tall, too big bezels top and bottom.
That video is a bit old now, How about an update now you have had them both longer?
But as I say, I watched it again and it's basically how I feel now. I've not really used the 6P daily since this, so I wouldn't really have anything new to say.
Last year when I chose the Nexus 6, I sold the Note 4. This year it's a closer decision and I can't bring myself to sell the 6P just yet. If they fix video stability there's a chance I go back to it.
Having said that, I've got a Gear VR on it's way, which of course wouldn't work with the 6P.