As mentioned, it was NOT a tsunami wave (at least not in the new one.) It was a rogue wave. Which, while not as large as sown in the movie (at least, not ot my knowledge) are otherwise as shown. A single, very large wave, out in deep ocean that does not reach land.
OK, I do stand corrected, then.
I would follow Josh Lucas. 
I’d probably try and get out so at least I’d be doing something, as opposed to just sitting there.
I would have gone simply because I can’t stand waiting and like to feel as if I’m taking an active role in getting things done.
If there is a group going and a group sitting, I’m probably in the group going (not that that’s always a good thing, but there you are).
It should be noted, however, that no rogue wave has ever been seen that reached 400 feet high. That may well be beyond physical limitations for wave size discounting something like a large meteor strike.
What bizarre quirk of fate ever put me on a cruise ship? I probably capsized my catamaran rowing across the Atlantic and got rescued… In which case I have my own lifegear in my cabin etc… so I’m looking for deck access to swim out to my own boat, which would now be upright 
Ha, I don’t know. Since I don’t like open water I wouldn’t be on the ship by choice myself. I’d probably been forced to go for some reason or other - a work function, kidnapping…
A real life example of this is the 9/11 attacks on the World Trade Center. People calling 911 were told to stay in their offices and wait for assistance. Most of these people died. There are only 28 identified people of the 130 who made 911 calls, and only one of them survived. Here’s a link to a newpaper article.
Most of the ones who said “screw this” and headed down the stairs survived. Sometimes authority is an ass. I’d make my own decision based on what I knew of the situation, not what I was told.
We once awoke on the 25th floor of a Manhattan hotel to fire alarms. I looked out the window and there were fire trucks on the street in front of our hotel.
We didn’t even discuss it- just jumped into the first clothing we could find, grabbed our sleeping children and headed for the stairs. Luckily it was a false alarm, but you don’t screw around with things like that.
If the chances of swimming down and out of the boat were impossible, I’d look for an acetylene torch.
P.S. Acetylene rigs also have an oxygen tank.