I've used Vimium for some months myself, and wasn't really happy with it. The reasons why mainly boil down to how Vimium is quite limited in what it can do. For example:
- It can't change the user interface at all - qutebrowser has a much more minimal UI.
- It can't spawn external processes. In qutebrowser, you can simply hit ctrl-e while editing some text input, to edit it in e.g. Vim. Or you can use ":bind ,v spawn mpv {url}" to add a keybinding which spawns mpv with the current page, to watch YouTube videos in a real video player.
- As soon as you are on some special page (like the Chrome extension store, or the "new tab" page), it stops working, because it can't intercept keypresses there.
- In general, qutebrowser is much more configurable and extensible. You can easily integrate it with shell or Python scripts via userscripts, and soon there'll be a Python plugin API as well.
