I used to have the Sennheiser 450SE which is the same as the 450BT except with the voice assistant. The sound was good. Although the comfort was terrible. The ear pads are too small and for most people the headphones sit on the ear rather than over the ear. I tried switching the ear pads, which made it more comfortable, but ruined the sound and noise cancelling. The clamping force was also too much for extended use. The comfort just made them unusable for more than an hour. When away from the desktop, I found myself just bringing Moondrop Kato with a USB C dongle and at my desk, I just use my HD560S which I comfortably wear for hours. I can’t comment on the other 2 headphones since I haven’t used them before.