In my experience, peizo lighters are reasonably reliable at lower elevations but nearly never work at higher elevations. I've thrown away my last dime on those. For sheer bone-headed reliability, I prefer a flint.

My low-cost suggetion, two Bics--one in his regular kit and a second emergency one stowed in a waterproof container or somehow sealed against moisture. Remove any tot-proofing in advance. Keep some fire-starters with the emergency lighter.

Cheers,