Internal vibrators are designed to penetrate; some are specifically designed to stimulate your G-spot. External vibrators are used to target the clit and labia. The rabbit-style (combo), which provides both external and interior stimulation at the same time, is the best of both worlds. Then there are anal vibrators, which have a flared base (to keep things from getting lost up there), and penis vibrators (or cock rings). There is no such thing as a “better” vibrator; it all depends on your own preferences and mood.