Manjaro is a really good distro to start with. It has very nice defaults including the correct zsh plugins. Should make your transition to Arch whenever the time comes very smooth. It does have a bad reputation because they don't seem to manage it well (e.g. keys keep expiring), and the said defaults are implemented in a very hacky way (if you see the code). Also they follow a delayed release which is really unnecessary given Arch is stable already; and in fact the delay can cause issues if you use AUR (which you will, eventually discover and learn about and love).