Originally Posted by Marq
....It is a little longer (based on an 0800 departure) than switching to Toie Shinjuku line at Shinjuku and switching again at Jinbocho but will end up being much easier on the feet and will guarantee you a seat for at least the first leg of your trip.
Marc
Don't count on the seat. The Oedo line cars are smaller than the older subway lines (it's been criticized for this) and as a result is often way more crowded.
Still, if you are switching at Aoyama 1 Chome, you are on the train only for a few minutes.