Mooby gives good advice! I tried out different distros in vm’s for 6 months after which I found myself very familiar and living in one more than my base os. At that point I nuked macos and installed Kubuntu no regrets. Kubuntu is a great start due to the popular Ubuntu base. Kinoite would be a good choice for its immutability. If set on Opensuse then choose Gecko as a more friendly way to install it.
Does anyone use the Oneplus 6T? It is suppose to be the most powerful hardware that can run Postmarket or Ubuntu Touch.