I have sat in both seats, and the 767-300 wins hands down. I slid right down the 757 seat when it was reclined and I was basically holding myself up with my feet. Did not like it and I did not like the A330-300 reclining seat at the time either. Had to sit up straight the whole time from LAX-NRT. When I finally got to HKG, I had been awake for almost 60 hours straight. Hope I never have to do that again.