I have stressed initial response because very rapidly other factors come into play. The main ones being any control input following the gust arriving and the aerodynamic roll damping term present in the wing design.
As I said the behaviour after the initial response will be modified by any control input.
Don't forget autostabs as well as FBW will move the controls.
So I reckon the original notion that quads would be steadier than twins is probably most likely to be true if you have manual controls and no stabs or dampers! Those were the days.