Shocker(turbo) or Impulse(turbo)? Which gun?

[OneArmedScissor]

i'm stuck between these two guns. I'm really not sure which one to get, ect.
which one will run off of CO2 better?
which one will run off of N2/HPA better?
which one is easier to maintain?
give me reasons why to buy which gun, ect.

thanks

[MINDofSIN]

Impulse Turbos are no longer in production. They were replaced by the Vision ACE.