Originally Posted by MysterySandwich
With my previous research, I learned, in a nutshell...
CO2 - Good for on-the-go, really compact and little effort to fill the tire
*CO2 inflated tires will lose air quicker than regular compressed air.
Hand pump - Good for at home.
CO2 expands and contracts with change in temp way more than air, so yeah CO2 will lower tire pressure when it is cooler and then when things heat up a bit the pressure will increase, regular air is better overall, but CO2 is great to have in case you get a low tire and don't have access to a pump or compressor and the CO2 rig is small light weight and easy to pack away in a small bar bag or whatever one has on their bike.