Should I get a rechargeable headlamp or one that takes AAA batteries?

Rechargeable lithium models are lighter, brighter, and cheaper to run long-term, which is why most current Petzl and Black Diamond flagship picks use them. AAA models still win for multi-day backcountry trips with no power access and for cold-weather use, since you can swap in fresh batteries. Several Petzl models like the Actik and Tikka offer hybrid compatibility, which reviewers consistently call out as a real advantage.