Well, I don’t want to offend fellow flutherites needlessly, but to me the outstanding distinction between those choices is that structural engineering deals with something that’s real. Nothing is real in advertising.
In any field, creative thinking is going to be an asset in some ways and a drawback in others. (As someone wisely said, they tell you to think outside the box, but the pay is inside the box.) However, some professions are definitely more creative than others.
I don’t know how close you are to completing your education, but you might want to do some research and think hard about what things are going to be like when you are ready to enter the job market. How will the nature of advertising change when companies have to be more frugal with their expenditures? Nobody really knows how to measure the effect of advertising; they just know that you sell more when you advertise than when you don’t. When everyone is watching pennies, will advertising dollars be trimmed significantly, or will companies push even harder for the consumer and corporate dollars that are out there for harvesting?
Which field is more likely to survive layoffs and cutbacks in spending?
At the same time, you may want to ask how much new construction there is going to be for the next while. However, things will settle down after a bit, and you have to think more than a few years ahead.
One other point: if you can find a way to combine talents and interests, you may find yourself possessing a unique and highly marketable combination. I don’t know what happens at the point where structural engineering and advertising meet (if they ever do), but it might be interesting to locate that point and see what’s there.
And finally, you might want to look at fields that are considered recession-proof. Health care, for example, is still solid.
Maybe by the time you get out of school all this Sturm und Drang will be past. But I, for one, don’t believe we’ll ever go back to the way we were, for the same reason that you can’t un-lose your virginity.