Dab rigs are used to vape your favorite concentrates, waxes, and oils. Some call them oil rigs, others say concentrate pipes, but they all are used to smoke your favorite dabs.
Vape pens are small, handheld units that enable "on-the-go" consumption of dry herbs and waxy concentrates. Their popularity has exploded as a way to consume discreetly while out and about.
When people first start smoking they will usually gravitate toward a smaller glass hand pipe. After smoking for a while they want to upgrade to a pipe with water filtration like one of our American glass bubblers.