I think you are mistaking a few things. pamac-gtk
is the GTK4-based version of the pamac
GUI, while pamac-gtk3
is the GTK3-based version.
In other words, pamac-gtk3
is an older design than pamac-gtk
. GTK4 is currently only used by GNOME and GNOME applications. If you’re on XFCE, Cinnamon, MATE, Budgie or even Plasma (which is not GTK-based), then you’re better off with pamac-gtk3
.
Besides, pamac-gtk
— i.e. the GTK4 version — requires the installation of separate and distinct plugins for FlatPak, Snap and the AUR, while pamac-gtk3
supports all of that without any plugins.
(Edit: The latter is no longer applicable.)