I just did YYZ-MUC return and had both 18AC and 35AC. I would never pay Row 18 on the A330 again...while there maybe more knee room than a regular seat, you can't stretch your legs much.

Row 35 is much better - the slide pack doesn't get into the way of the window seat at all. The only issue is that it gets cold by the exit door.

I would recommend 35 AC/JK hands down.