Is the WH-1000XM3 the newer Sony one? I can’t remember the ones I tried as it was a couple years ago. I just remember asking my colleague what he thought and he pulled a pair out of it’s case and it was hanging on by a thread (or at least looked like it).
I’d probably stick with Bose though even if Sony’s are technically better. Bose seem to have perfected comfort and if I switched I’d probably end up in the same scenario as when I switched my PC headset from the wired HyperX Cloud 2 to the wireless Arctis 7 and immediately regretted the decision as the HyperX felt far superior comfort-wise.