I don't know about Tumbleweed. Garuda isn't difficult, unless you have to troubleshoot something. There are a few things to keep in mind, though:

1. It's an Arch distro. Arch is considered not beginner-friendly to begin with, and Garuda does some things differently. It's very opinionated, and, like I said, some of the design choices are questionable.

2. If you need to do anything on the command line, you should be aware that Garuda uses the fish shell instead of bash (which is the standard for Linux distros). You might also want to check out ~/.config/fish/config.fish, because there is some interesting, funny, and weird things in there. For example, ls is aliased to eza.

3. Do you like macOS? Because that's the default setup: global menu, dock, etc. You can change all that, but it takes a lot of work.

There are a lot of good things about Garuda, though. There is tons of eye-candy. The fish shell is much more enjoyable to use than bash. The chaotic-AUR repository gives you access to even more software than standard Arch repos. And whenever you upgrade, it automatically takes a snapshot of your system, so that if something breaks, you can roll your system back to a previously-working version!