what is the best green gas?

Anyone know what the best green gas bottle is?
I don't know how to use propane, if you guys could explain how to use propain for a GBB, it'd be nice. Thanks

Okay, while I will explain the process of propane, you have to promise me you WON'T use it!! It has broken THREE expensive GBBs of mine (Colt 1911, KWA USP .45, and my TSD Luger) SO first you need to buy one of these:

http://www.airsoftplayground.com/guns/Airsoft-Innovations_PropaneAdapterVer4.jpg

They're about 20-25 dollars on most online stores. Then, you need to buy the actual propane:

http://www.mclendons.com/img/products/10/10225120.jpg

They're also very cheap, I got three for 12 bucks at my Army Surplus store. That's probably the most appealing thing about propane to most people. Then you screw the adapter on to the top of the propane tank, like so:

http://www.airsplat.com/images/Green-Gas-Propane-Adapater.jpg

Then, you just load it into the magazine like normal green gas (Stick the nozzle in the bottom of the mag and apply force)
I do NOT suggest using it. And on some gas guns you may find that usage of propane voids the warranty. just trust me stay away from it. As far as green gas brands, I really can't tell the difference between most other than the logo on the bottle. I use Firepower gas and UHC gas. I can't really tell the difference between the two.