Passenger Martin Mars

A description of the plane can be found at

http://www.scribd.com/doc/12874446/The-Martin-JRM-Mars-Flying-Boat-Commercial-Projects-of-1944

Observe such details as:

Maximum beam 411 cm. Wider than A320.
Two decks.
Wing 1,8 m thick. A man could walk erect in the wing, and there are doors to the wing passages in front of the wingbox. The rear of wingbox is a luggage hold.

The captain is NOT having flight controls. Two pilots are sitting at controls, but the captain sits behind them, facing left.

The upper deck is slightly narrower than lower. Maximum 4 seats abreast+ aisle on upper deck, except the 5 seats at the end of the aisle. And the aisle is off center, 3+1. Lower deck seat arrangement is 3+2. Lower and upper berths are offered on both decks.

So, between Martin Mars (that did not enter service), Latecoere 631 (which did enter service) and Saunders-Roe Princess which did not enter service, which of them would you rather fly as a passenger? As a pilot? As a captain?