interesting discussion here... coming from watches to knives...
i own both mechanical and digital watches... the durability of g-shocks and the history of them living up to, or exceeding, their intended design goals (triple 10 design - 10 yrs battery life, 10 bar, 10 storey drop) with some hip endorsements/projects and real world survival stories (black hawk down, french navy seals, environmental projects, design projects, etc...) add to their popularity.
I have a bunch of g's ... I also have a bunch of mechanical/auto watches. I wouldn't hesitate dropping a g-shock out of a 10 storey window and have it continue to work... (I have also left one in a freezer for a couple days, frozen in a solid block of ice, to see what would happen... not much..

) ... I don't have a rollie but do have some 'nice' watches with decent specs... I don't know that I would throw one of them out a 10 storey window and expect it to work at acceptable standards without some kind of regulation. (not to mention the dings on the case)
Rolex watches are built out of some pretty tough materials (chemical grade stainless iirc) forged/stamped cases (not cast, iirc)... so no doubt tough.. they have a long standing history in the military as well... so hard use is a part of the appeal. Panerai and Blancpain, to name a couple, share 'hard use' history as well... (whether you want to put a $4k watch through the 'meat grinder' is a different story)
technically a watch with atomic (+ gps?) sync is probably as 'accurate' as you're going to get, but the sync is like getting a mechanical watch COSC regulated every night.
mechanical/auto movements can last quite a long time, but the reality is that they will require service... friction does things to moving parts. the rolex paraflex shock system is pretty awesome as far as shock systems go, but a balance wheel is a very fine and precise thing... shock is not its friend. I've accidentally dropped movements while working on watches with no noticeable affect, but I try not to do that too often...
a digital movement (like a digital display g-shock) has no moving parts.
I have scratched every type of crystal.. plexi, hardlex, sapphire, whatever... i seem to have the ability to scratch them all...
All said and done, i set my mechanical watches by my digital watches (atomic), or cellphone (atomic clock app).