Both aligner brands use clear plastic but differ in materials: one uses SmartTrack with “buttons” for better grip, while the other uses gentler, more comfortable TruGen. The second brand’s aligners, made of medical-grade polyurethane resin with hand-trimmed edges, are more comfortable than the first, which can cause some gum discomfort. The second brand is available only through licensed dental professionals, while the first is more widely accessible. The first brand is generally more expensive due to its features and financing options, while the second is more affordable with fewer features. The second brand’s aligners are also more stain-resistant and transparent, making them less visible than the first.