Main differences between Bose Noise-Canceling Wireless Bluetooth Headphones 700 and Bose QuietComfort 35 II Headphones: - While Bose Headphones 700 come with 11 levels of noise cancelation, the Bose QuietComfort 35 II Headphones come with three levels of noise cancelation. - While Bose Headphones 700 support Amazon Alexa and the Google Assistant, the Bose QuietComfort 35 II Headphones only support Amazon Alexa. - Both the Bose Headphones 700 and the Bose QuietComfort 35 II Headphones provide up to 20 hours of battery life. - While Bose Headphones 700 come with intuitive touch controls, the Bose QuietComfort 35 II Headphones come with button controls.