The Bose QuietComfort Ultra is the better choice due to its advanced noise cancellation and customizable sound, but it's more expensive. The Bose QuietComfort 35 II is a good option for those on a budget, but it's an outdated model. According to CNET, the Bose QuietComfort Ultra has a noise cancellation rating of 9.2/10, while the Bose QuietComfort 35 II has a rating of 8.5/10.