Puff counts are estimates
Manufacturers rate puff counts under lab conditions with short, even draws. Longer or harder pulls use more liquid, so real-world totals are usually lower. Treat the number as a way to compare models, not a promise.
Rechargeable batteries matter
Most large-capacity disposables now charge over USB-C. A rechargeable battery means you can use all of the e-liquid instead of throwing the device away when the battery runs out first.
Power modes and screens
Some devices offer a regular and a boosted mode. Boosted modes give a bigger cloud but drain liquid and battery faster. Screens that show battery and liquid level help you know when to recharge or replace.
Pick flavor first
The device you enjoy most is the one whose flavor you like. If you are unsure, start with a single unit before buying several.