From vdiff.el:

;; ediff is a powerful diff tool built into Emacs, but it works differently. In
;; ediff you control the diffed buffers through a third control buffer, which works
;; great until you want to edit the buffers directly. I prefer the way vimdiff
;; works, but I am also not necessarily interested in perfectly emulating
;; vimdiff. vdiff does not assume you use evil-mode, but is compatible with it.