I have a butane and one like #1. The only one I ever use is the butane one. #1 is WAY too heavy to be used practically. It's awkardly shaped and like 2 pounds, if you're trying to solder up in random places in the car, it's nearly impossible. Not to mention you need power for it. The butane one goes anywhere I go, it's small, heats up extremely fast, and very easy to manuver. The tip is also pointy enough to solder very small things. Not to mention it doubles as a butane torch.
I wouldn't use a soldering gun for PCB or delicate work, but for coaxial connectors or other stuff that needs a lot of heat to avoid getting cold joints, they are a lifesaver.