Slurpee, because it's the most familiar. I don't know much about Icees or Slush Puppies, but aren't there far more options (flavorwise) with the Slurpee? I'm 99% sure that Icees only come in Red and ...

There’s a particular sound synonymous with movie theaters and convenience stores: that icy whir of an ICEE machine churning neon slush under fluorescent lights. Soon, you’ll be able to grab those ...