Wow, LXQt is just motoring along aren’t they. I use LXQt as my daily driver, but on good old Debian Stable I won’t be seeing this for years haha. Looks like it is only available in the AUR and on Pisilinux (which is cool because it’s only just been released!).
If you’ve just installed Ubuntu, stick with it for a bit. Get things set up the way you like them. Make a mess if you must. But don’t switch because someone on the internet said one is better than the other. Lots of the Linux sites are just content farms (that 9to5 site) and copy other sites and then people read those and they suggest what they read.
Mint does have some bespoke tools that users like, but those tools can be installed on other distros.
Anyway. First, play around, make a mess, clean it up, get used to it. Then figure out how to backup the configs before you reinstall a new distro.
Other beginner distros are Zorin and Elementary.
I’m a Debian user myself, but I’ve been around and have tried many different distros, WMs, DEs, etc. over the past 19 years. Keep messing around and you’ll find your comfort zone.