Optical and capacitive fingerprint scanners use fundamentally different technologies to verify identity. Optical scanners capture a 2D image using light, making them highly durable and ideal for rugged, high-traffic environments. In contrast, capacitive scanners use electrical currents to map the 3D ridges of a finger, offering superior anti-spoofing security and a compact footprint that is perfect for smart locks and consumer electronics. Ultimately, the best choice depends on whether your specific application prioritizes environmental durability or maximum security.