X-700 may be better, but XD sure feels better. Personal opinion, of course.
Hopefully not seeming desperate to get the last word™, as a pretty extensive user of both bodies, I can say they are at about the same level in feel.
The little bit of extra metal present in the XD makes no difference. The frame on both is metal.
The wind is butter smooth on the XD. But does it feel more sturdy or reassuring? Not to me.
The touch-live SR button on the 700, is as good as a leaf switch can feel, and the shutter sound, is if not super quiet, then super reassuring and satisfying.
It's a bog standard rubber curtain and good riddance for that. It has the same speeds. The sync speed is not enough to make a huge difference in daylight. It's only with thin titanium and carbon blades that vertical bladed shutters really comes into their own.