Tanjiro's water breathing technique differs from other demon slayers due to its unique style and form. While other demon slayers may use different breathing forms such as flame or lightning, Tanjiro's water breathing style focuses on incorporating the fluidity and adaptability of water into his swordsmanship. This allows him to fluidly switch between offensive and defensive maneuvers, making his fighting style more versatile and unpredictable compared to other demon slayers.