Comparing 3M and Avery Dennison depends on an investor's or customer's specific focus, as both are premier American materials science innovators with distinct market strengths. 3M is a massive diversified industrial conglomerate operating across healthcare, electronics, and consumer safety with a much larger product portfolio. Avery Dennison focuses deeply on specialized pressure-sensitive labeling, graphics, and digital identification solutions, often praised by niche investors for its targeted market dominance and operational efficiency.