When you're comparing devices, don't just look at the coil type. Here are the other things that matter:

• Battery capacity: Measured in mAh. Higher means longer use between charges.
• Airflow control: Lets you adjust how tight or airy the draw feels. Some people like a tight draw, others prefer a loose one.
• Build quality: A device that feels solid in your hand is more likely to last.
• Compatibility: Make sure the device works with the type of e-liquid you plan to use. Some are designed for thicker oils, others for thinner ones.