Sigelei Kaos Spectrum VS Sigelei KAOS Z, Progress or Backward?

Hi everybody,
Do you remember Sigelei Kaos Spectrum VS Sigelei KAOS Z? They are the representatives of Sigelei Kaos mod. But compared with Sigelei Kaos Spectrum, how do you think about Sigelei KAOS Z? Progress or Backward? Please comment to us~~

Sigelei Kaos Spectrum 230W TC VW Variable Wattage Mod features 6 changeable LED colours and has a pure power output of 230W and has "the most stable microprocessor" on the market!
The Kaos Spectrum has a bright, clear 0.96" TFT display, as well as variable wattage and temperature controls. This device requires 2 x 18650 batteries (not included), and is compatible with coils that have a resistance range of 0.1~3.0 ohm.
Price: $36.99on

Please learn more about Sigelei KAOS Z-$47.99