I prefer using milk and buttermilk because it produces the perfect egg-free waffle recipe. Buttermilk makes these waffles tasty, light and fluffy. Milk helps make these waffles crispier. Take the waffles out of the freezer and use the toaster or toaster oven to reheat and crisp the individual waffles to your liking.
Technically, you can, but I recommend using buttermilk in this egg-free recipe, since the acid it contains reacts with the leavening agents and makes the waffles fluffy inside.