There's a split in the office I work in. I have the QC35's along with a few others, but the rest have XM3's. I don't like the XM3's as I find them to be too tight (plus I wear glasses and it pushes the frames into my temples), but the ANC on the XM3's is better than the QC35's.

So it's basically down to how they feel when you wear them - consider the fact you might be wearing them for 7+ hours.

I think both companies do ANC in ear headphones too, if you don't like massive headsets.