This is not the group stage anymore, I doubt we are going to see lots of goals from USA vs Ecuador game, now things are really serious. The fact that US don't have some key players will make them play more defensively too, I think.
And Ecuador has chances of getting to the next stage, they are second in South American classification for World Cup and won against Argentina last year
For all those points given I would say that ecuador are the ones who will come away from this game as victorious!
They are just such a powerhouse of a team and that will show thru in how they will handle this American soccer team.