Sounds like a research project.
In any case, I did dabble with (ie, used for at least 6 months) Windows Mobile; Symbian; Blackberry; Palm's Garnet, Cobalt, and webOS; iOS; Android 4, then Android 9++.
Some quick points:
- As a phone doing expected phone functions (ie, anything we expected from the older Nokia phones - calls, text), they were more than adequate for their tasks.
- As web browsing devices, they were not up to the task for anything more than basic web surfing. HTML5 performance was a hit-or-miss, with noticeable performance and power penalty for the phones. This was less the case in the last few iterations of Windows Mobile, but it was still an issue since HTML5 grew faster than the browser+OS kept up.
- Apps - this is the big differentiator. We see why Huawei elected to go essentially using Android for HarmonyOS. Most of the alternative platforms have very poor web stores, so you might luck out and get WhatsApp (thanks to Jan Koum and gang), a simple unofficial Facebook clone, but not many other apps. Developers just won't dedicate resources to develop apps for small platforms.
With the app situation, you can still see it today when you look at smart watches. The Apple Watch is the gold standard for apps and 3rd party developer support. Google's own WearOS is nowhere near, and Samsung's TizenOS is even worse off in that regard. There are apps, but nothing as comprehensive nor functional.