Depends on if I'm using a straw or not. If I have a straw I dont care, but without a straw (which is 99% of the time) I prefer cubed. I hate getting all those little ice flecks in my mouth when I am trying to enjoy my beverage.
I agree that crushed seems to cool the drink better, more surface area I guess. However I like cubed, definitely easier to drink when not using a straw which is 99% of the time for me.
cubes all the way, baby. i've got heart cubes and arrow cubes and star cubes and smiley cubes and flamingo cubes ..... i just love love love me some ice cubes!!!