The Explore Scientific Montura iEXOS-100 PMC-8 Wi-Fi GoTo mount will likely not be a good choice for imaging with any of the telescopes you mentioned with it. It just won't have the stability and as others have said, viewing through a Newtinian on a GEM can be ergonomically unpleasant.
The Newtonians that are on Alt-az mounts will be much more comfortable for visual work, but not at all suitable for long exposure imaging.
So, either you should take imaging off the table for now and turn towards a more capable telescope or take the Newtonian off the table and focus on a telescope that is more in line with the mount capabilities. This though means a smaller scope that won't be as enjoyable for visual observing.
A compromise there is to get a smaller scope on the GEM and couple it with an imager like the Revolution 2. The Rev 2 is an EAA camera which can show objects with a very short integration time. For example, if you used an inexpensive 80mm ED scope on the ES mount, you could get near real time images of many interesting subjects.
And that would be my advice. Light pollution can make telescopes very unrewarding for visual use but if you live under dark skies, even an 80mm telescope can be fun to use. Under brighter skies though, an EAA camera like the R2 on a Go2 mount can let you explore some beautiful sights.
And if you decide to go towards a more capable telescope, something like the Orion Intelliscopes that have object locators can help you find things to see and while it does not track, in an 8" scope, it is pretty easy to push the scope along with the target. You can even do a little EAA with an intelliscope, but you are more limited to brighter objects. It would also provide really good planetary views.
Edited by Eddgie, 06 August 2020 - 09:35 AM.