Now that I have several bikes (didn't know they were addicting) is it just easier to buy the CO2 cartridges instead of having a pump with your bike?

I hate to buy two more pumps to screw into each bike. It would be great if you could just buy one pump, 3 clips and switch out when needed.

I haven't used a CO2 cartridge so I don't know how well they work.

Since I have different bike tire sizes (My 29er should be here today), the Sirrus and a Trek, would it be easier to buy a saddle bag for each bike instead of switching out the bag? I was told that keeping a spare tire was more convenient than carrying a patch kit even though the tire takes up more room.

I know it's more personal preference but with my ability to go farther from home now, if a flat happens, a quick easy fix would be nice so I'm not stranded by the side of the road looking for a hole in my tire to patch up.