Depends in what sense you speak. I would wager for the vast majority of players, the MXR is far more suited to them and therefore "better", the FI by comparison is far more difficult to program and needs a better knowledge of synthesis, whereas the MXR is still comfortably in the realm of tweaking knobs on the fly until you hear something you like.
I'd like to try one, but I'm conscious that most demos i've heard of it are nowhere near as good as the initial video sounded, and much as I love the interface, I don't like the C4 esque lack of easy foot accessible presets, combined with lack of midi.