Garuda is nothing like Manjaro. It’s more like EndeavourOS, as it uses the Arch repos, plus additional stuff.
It’s pretty great, though I personally find it a bit too bloated for my taste, at least the “ultimate editions”. But if you want easy to install Arch Linux pre-configured for great performance, especially for gaming, and do not want to invest time and effort into configuring it yourself, Garuda is pretty awesome. Unlike EndeavourOS, Garuda is a much more opinionated distro. Some might agree with its philosophy, some might not. EndeavourOS is pretty much bare-bones Arch with a GUI installer and a few scripts, Garuda is heavily pre-configured. This may or may not be what you want. I haven’t looked at a lot of the settings in detail, but most of it seems pretty reasonable and I get the impression @librewish knows what he’s doing.
Garuda also has a great forum, much smaller than this, but just as helpful.
I do agree with @dalto, however, and I am not entirely sold on the Chaotic AUR repo or whatever it is called. I can see it being a potential security liability. Personally, I prefer to just use the AUR and build the packages myself. Makes my tinfoil hat less itchy.