A couple of comments on the Amscopes.
The one I purchased a year or so ago now came with an LED ring. I found this was quite intrusive for getting the hot air iron in, so I removed the ring and instead I use two clip on gooseneck LED spots at different angles clipped onto the scope mount.
https://www.amazon.co.uk/Lloytron-L1507SV-Apollo-Clip-Silver/dp/B00GMFKRI2The key points about this specific lamp are that (a) it's a concentrated narrow beam, and (b) it doesn't "beat" when taking video, a facet which I found to be very common in the various other illuminating options I tried.
Secondly, on the unit I purchased I discovered that despite being trinocular, the left side is switched mechanically between either being directed to eyepiece or to the camera port, you can't have all three ports active simultaneously.
Mine came with the articulated arm which clamps to the desk: this fits well in my situation as it minimises the amount of desk space used when it's folded away.
The FOV is indeed smaller on the two cameras I have used on the Trinocular port. I have an adapter to minimise this but the FOV is still significantly smaller.
Edit: I use a third party C-mount 60fps 1080p HDMI camera but despite the specs I still find it much worse than using the stereo eyepieces for working on stuff. Part of this is the latency and part is the camera itself, possibly to do with its dynamic range, but I get scintillating artifacts. Not being stereoscopic I am sure is also part of it too.