I know it has a shitty “95-ish” look to it, but distrowatch.com is quite possibly your best resource in finding out at a glance which of the distros you’re interested in are stable or rolling, and how popular they are. Go down the page hit ranking on the right, and start clicking: you will see the root build of every distro, whether it’s stable or rolling, the last release date, links to reviews, etc.

It won’t get you to your final decision, but it will get you to a shortlist. And then you can start making LiveUSB sticks to test drive your distros of choice in RAM without having to install anything. There are very few distros that require a full install to try out; if you run into one you can always use old hardware or a spare disk, etc. Mint has a LiveUSB of all its DE choices, Pop!OS has a LiveUSB, you just need the USB sticks and something like Rufus to make them with, and you’re ready to test drive.

Well worth the trouble, IMO. Good luck.