Aluminum ski poles are the best choice for most recreational and all-mountain skiers. They're durable, affordable, and forgiving—meaning if you crash or bang them against something, they'll bend rather than snap. That bend-instead-of-break quality is actually a safety advantage on the mountain.
The main trade-off is weight. Aluminum poles are heavier than carbon fiber, which you might notice on long days or touring trips. They also transmit more vibration from the snow, though some skiers actually prefer that feedback for feeling the terrain.
If you're a casual skier, a beginner, or just hard on your gear, aluminum makes the most sense. Save the carbon fiber investment for racing, frequent touring, or if you ski dozens of days a season and appreciate every ounce of weight savings. For most weekend resort skiers, aluminum poles get the job done reliably.