The popularity of glass chillums is very high because the hookahs have many advantages in comparition to other smoking accessories and a hookah is definetely better than a cigarette or a pipe.
The bong is a highly professional device with a water filtration, which gives a big advantage during smoking.
Bong is made in a shape of face mask which means you won't loose a gram of your favoite taste.
The chillum's main advantage is that the liquid (wine, water, etc.) at the bottom of the device filters out the smoking mixture of negative impurities quickly and efficiently.