For me, its a toss up (no pun intended) between my Tenga toys and Lelo Billy. Why? Well the Lelo vibrates and is super smooth, and the Tenga masturbators provide different sensations. When the stranger breaks out the Tenga toys, woah boy! If Billy comes out to play with the stranger, holy shit man. Watch out! It's game over.

For me its the Hitachi when it comes to vibraters but my other favorite toy is a slicked male chastity device which works great with electric play.