demomantf2real

Manjaro is aimed more at newcomers from what I know. You're usually supposed to use GUIs instead of CLIs for a lot of thing. Personally, I don't use it (Garuda and Endeavor are my favorites), but I don't see the problem with using it.

IMO, Arch (and most Arch-likes, Manjaro being the exception) has a big focus on customization. The goal of Arch is to let you basically do whatever you want, whereas Manjaro is designe to work out of the box. As kalzEOS on r/archlinux put it:

Manjaro (and other similar distros) is like ordering a pizza from a pizza place. It comes to you all done and ready. You accept whatever they put on it and eat, or you can pick the toppings that you don't like and eat the rest. Arch is like buying the bread, the sauce, the cheese and the toppings that you want, put them all together, cook it and enjoy. The final result is the same, but the first one takes less time to fill your stomach. Lol

I have dual-GPUs and Arch seems to work fine for me. I'd try it out on a live ISO before you wipe Debian though.