Dual battery flavor machine VS small & sexy high nic pods

The trend has definitely been toward smaller devices, but at a cost in leakiness and smaller capacity batteries. 

• Dual 18650 devices provide the best possible flavor. The thick vapor clouds carry more nicotine, allowing for 3mg and 6mg eliquid.
• Small pod devices with built-in batteries put out a thinner cloud which requires 10mg to 20mg eliquid. This is the whole reason for creating salt nicotine - salts are much less harsh at high levels.
• Disposables have the battery, coil, and eliquid all packed into a sealed unit. You puff until the juice runs dry (or until the battery goes dead, which is more likely) and then dispose of the whole unit. Oliver Vapor will trade ten dead units for a free fresh one, and then we will dispose the battery for you. 

You can get an equivalent dose of nicotine from any type of vape, with a little forethought. None are "better" - each has its pros and cons.