Just to share my own experience of trying to make this my daily web driver, both these solutions are using webkit, and webkit behaviour is not exactly perfect and can be a real pain to update. Same issue with Nyxt, which I very much wanted to use. In the end I went for Trydactyl which give the best of both world: a web browser that works, with a decent ecosystem for extensions (lack of ublock is very quickly felt, even if yes there are some alternatives but... not as good and simple) and a powerful interface that you can mod to your needs, vim or emacs shortcut can be used.