I use a small camera with 3 or 4x zoom and build my own adapter so I can film through my spotting scope. If I didn't want to build my own adapter I would buy a scope cam adapter from Tines Up. I personally would rather spend more money on a nicer camera and build an adapter. My new Sony Rx100ii will be here in the next couple of days and I will start building my adapter.
The super zoom cameras are easier to use but I don't think the footage is as good at long distances. The Nikon P900 is nice and so is the Canon Sx60hs.
Phoneskopes are good if you are close not so good if you are very far away.
[font face="verdana" color="green"]
Jake Swensen