I have the QC35 and the XM3. I've had 2 pairs of XM3 that pick up a faint rumbling noise in one ear, it doesn't go away with reflashing the firmware or anything. The XM3 I bought, 3rd pair, that doesn't have that problem came with a cracked headband, it's currently sitting in pieces as I had to desolder 12 tiny wires to replace the cracked part.

It's possible you got a firmware update on your bose that nerfed ANC.

I vote, replace your Bose earpads and use those till they break and then buy something neither bose nor sony if you want an improvement, ANC headphones are starting to get some quality options like Focal Bathys. I personally won't buy any new bluetooth gear that doesn't support LDAC, Aptx-Lossless or at least Aptx-HD.