Yeah, I always hesitate to recommend distros. 😅
There's tons out there and they all exist, because some smart person decided to put in lots of work, as the existing ones didn't match what they wanted.

If we exclude Ubuntu/Debian-based, that narrows it down somewhat. The other major distros are:

• Fedora: Rather much tied to the corporate side (Red Hat / IBM), tends to be rather up-to-date. Kind of has a focus on GNOME, but other "Spins" are available.
• Arch: Community-driven, pretty much a DIY distro, so the initial setup is somewhat challenging. It's really up-to-date, so much that it's referred to as "bleeding edge" (rather than cutting edge), meaning you might get faulty updates from time to time. It's also often loved by minimalists, because they can decide for each component, if they want to install it.
• Well, and perhaps the most niche of these – which is what I'm on – openSUSE: Has the best integration of KDE (not by a huge margin, but still). I like it in particular, because of its snapshotting system. It automatically starts snapshotting your OS (not the user files) once per hour or whenever you make changes to the installed packages. If something breaks, you can boot into a previous snapshot from the bootloader and roll things back.
  It's the most "maximalist" mainstream distro, in that it preinstalls relatively much software. Personally, I think the other distros are a bit silly with their minimalist tendencies, but yeah, I'm biased. And well, downsides of openSUSE are that it is somewhat niche. You'll find a helpful, tight-knit community, but it's less likely that guides mention how to do things on openSUSE. Similarly, you're less likely to find pre-packaged software for openSUSE. May have to compile from source more often, although SoS has a good amount of software, too.

As for whether a different distro is too much experimenting, if you do jump into it, you'll understand why I talked about the desktop environment instead. 🙃
The DE makes a much bigger difference. Some people conflate distro and DE, because certain distros will have certain default DEs.
But if you used the same DE on two distros, honestly the main difference you'd notice is a different package manager. Where Ubuntu Studio and Mint use apt, openSUSE uses zypper, Fedora uses dnf and Arch uses pacman. They handle somewhat differently, but largely do the same things (i.e. install/update/remove packages).
Obviously, there are more differences to the distros, like how quickly they update and some of the default configuration, like the snapshotting I raved about, but ultimately it's still a Linux system with much of the same software running on both...