316 stainless steel center cartridge & lead free copper center cartridge, which one do you prefer?

[Zora0605]

Hello everyone,
316 stainless steel center cartridge is becoming more and more popular in market.
There are so many cartridges now, which one do you like best？

[Zora0605]

Disposbale vape pen with the same cartridge, it’s portable to vape.

[Zora0605]

Different tip to choose.

[Zora0605]