We've had a couple debates before about power sources for gas guns, so I figured this would be good to post. Nothing on CO2 though.

If you're too lazy to watch the video, here's the conclusion:

Green Gas
Pros:
-You don't need to mix silicone into the gas.
-Smells better than propane
-No adapter needed

Cons:
-More expensive than propane
-Harder to find than propane
-Weaker than propane


Propane
Pros:
-Significantly chepaer than Green Gas
-Easier to find than Green Gas
-Gives a 10-20 FPS boost

Cons:
-Propane adapter needed
-Silicone needs to be added
-Smells