Co2 will out shoot a pump air rifle here is a good example

Let's start with CO2 power. CO2 rifle has a cartridge filled with CO2 inside it to provide the propellant for the pellet. You have to replace the cartridge when it empty's of CO2. An air rifle is one that uses ambient air for a propellant. Usually the air rifle will have a pump mechanism to pump ambient air into the rifle, where it is stored under pressure until the gun is fired.
My advice is to get the multi pump pneumatic like Benjamin 397 or 392 and it will shoot straight, it will shoot hard and it will last many years. I also as secondary enjoy using the versital break barrel air rifle. Because ambient air is reusable and once a CO2 tank is open it cannot be closed. And break barrel rifles are the most accurate and fastest, which penetrate well. I also recommend the gamo whisper, or any break barrel rifle made by Gamo. Daisy is suitable, depending upon what you will be using it for and under certain shooting conditions will work in a pinch.
Yes and no...CO2 rifles use a pre-charged cylinder, which is pressurized to a certain PSI. Air rifles on the other hand, use a manual pumping action to compress the air into an on-board chamber. To sum up...CO2 rifles can fire repeatedly, while air rifles require some time in between shots (to pump the gun, to build up the air pressure). That is the basic introduction and explains them in short terms.
Crossman.com and Beeman.com have pretty good sections on the different types of airguns. CO2 is compressed carbondioxide. its basically an airgun with pre charged cylinders. it can get expensive to shoot C02. Crossman makes good CO2 guns. archer airguns.com imports Chinese imitations and the qb78 is a pretty good copy.
Pros of CO2 is that they are pretty accurate;
cons