As it's not our primary residence, we are looking into putting in a tub surround rather than re-tile. (Easier and more economical.)
Here's the arguement: I'm a big fan of rockboard for water damage prevention. It's used in any bath we've done that we've tiled. However, the friend doing the work for us insists that greenboard is the way to go for a tub surround (he says better adhesion) and rockboard is strictly for ceramic tile (again, better adhesion but for tile only.)
It's critical I keep water from getting behind the new tub surround. What do you think? Greenboard or rockboard?