My sister has been on a green tea kick for a while, since she turned 35, and moved to a new house.  I was trying to decide whether to buy her the BONJOUR ZEN TEA KETTLE, or the BONJOUR TEAR DROP KETTLE. The Tear Drop Kettle was a pricier unit, so I assumed it was bigger or more durable; but this is not the case. The ZEN allows you to make up to 42oz of tea, whereas the TEARDROP makes only 27oz at a time. As the product description states the TEARDROP is good for the green tea or white tea enthusiasts as it has a double wall glass design versus the single glass wall design of the ZEN. Also, the design of the tea infuser of the TEARDROP allows the steeping process to maximize retention of the antioxidant properties as well as flavor and color. Even though I really liked the novelty of the ZEN, I decided my sis would appreciate the TEARDROP functionality for her new health kick.