I'm a fan of Co2 cartridges, but I get why some others aren't. They are faster & if you mess up with one, you have a backup. Pumps take longer, and if you break yours you have no backup at all. I'm not suggesting that all pumps break all the time, but they certainly do break on people (have a look back at any of the 'looking for a new pump' threads for confirmation). For me, the risk/reward calculation works in favor of the co2 cartridges. Not meant to try to change your mind, just putting out the other side of the argument.

If you are counting on using gas station air pumps, check on what type of vales your tires use. If they are Schraders (look like your car tires), you're good. If they are prestas, they won't work with gas station pumps directly. you can buy a tiny adapter for about $1 from any bike store that will make them work just fine.