Dab rigs and bongs are excellent smoking devices that utilize percolation to purify vapor or smoke. While they share similarities, such as percolation and filtration, there are distinct differences regarding usage, size, and price. The key difference between dab rigs and bongs lies in the substance they are intended to be used with. Dab rigs are specifically designed for smoking concentrates, such as oil and wax, whereas bongs are crafted for smoking dry substances like herbs and tobacco.