paultavilla,
Several questions come to mind before we even consider the snow issues: why the X series? Is size a consideration? What will your mowing conditions be like -- area, slope, trees etc. Will you be doing any loader work? Do you intend to do any tilling, post-hole digging or other 3PH work? The X series are awesome machines, but often a CUT or sub-CUT offers more bang for the buck.
As for your snow handling question: the 46" is a snowthrower; single stage, that operates by forcing snow into its impeller and "throwing" it out. The 47" is a snowblower that uses two stages (two driven impellers) to "blow" the snow. Both have their advantages. The snowthrower probably moves a large volume of snow quicker. Having only one shear point, it probably is better with gravel. The snowblower has two shear points (on each revolving blade) and can be a problem with gravel. On the other hand, the two-stage is probably better in heavy-wet snow, although there is a good chance the single-stage would work just fine.
My personal experience is with the 46" snowthrower, and I have never seen a situation that it couldn't handle.
Give us some more specifics, and perhaps we'll be able to help more. /forums/images/graemlins/confused.gif