Refillable butane for me. I have three, but use my Xicar Old Boy the most. One day I'll get the real McCoy, and maybe a Rollagas if I can find one cheap.
Zippos are fine, dependable, but require too much refueling. However, for those complaining they taste the fluid, just hold the tip of the flame further away. The air above the tip is just right for igniting the tobacco without overheating it.