I have used Ubuntu Touch for almost ten years now ;) I personally enjoy it a lot, the navigation feels a lot more natural than on android and Ubuntu just generally does what I want it to and not more, which is also a plus.

But, I have to mention I have relatively low standards when it comes to a phone os. I don't use any of the popular apps for example. If you need e.g. WhatsApp or similar, you won't find that there. I have tried using waydroid for a couple of things, but it is draining the battery fast.