Originally Posted by bostontrevor
I also maintain that the low angular separation between teeth and the larger ring and cog circumference means that it takes more chain slack to throw the chain, but that's just my pet theory.
Same theory here, sorry 'bout stealing your pet.
Another point is that, the crank will be up for more chainring changes than the hub will be for cog changes (bolts vs threads), if you like to fiddle with your gearing a lot.