Which MOD should I buy? (and tank with it?)

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Hello everyone, I'm new here and I need your help.

I currently own iStick Pico with cerabis ceravape tank. Awesome mod/tank.

I, however, want to buy another MOD.

Here's what I narrowed it down to:
VT75 Nano HCigar $68 (no tank)
eVic WTwo Mini &34 (no tank)
Smoant Knight $44 (with the talos tank)

They all seem great, but my only concern is why is the VT75 so much more expensive than, for ex. eVic WTwo Mini? Like, literally double the price of eVic...

With that being said, I'd also want...

Which MOD should I buy? (and tank with it?)

Which MOD should I buy? (and tank with it?)