A very simple experiment: just ask around in the top JCs which courses they will be taking. I'm sure engineering ranks last.

However, the "converse" is not necessarily a good indicator --- during the life sciences hype, many top students wanted to take bio- and life science-related programmes, which we now know in hindsight is to the detriment of their working careers.

So, avoid the courses at both ends of the popularity spectrum. I suggest that you go with 2nd or 3rd most popular course.