9A is partly blocked at your feet by the slide, however I don't find it that much of a problem. The other thing I don't like about 9A-9C is that if you board early all the other passengers have to come by you and many people don't show any regard for who their bag might hit on the way in. Row 16 is great, given those choices I would take 16C-16D. My favorite seat in E+ on the 757 is 9D btw.