Its Kindda like a debate,
You dont necessarily have to be an enigineering/medical student, Dr./Engr. to partake.
Simply defend your stand with supportive claims,
Should be a good forum to get a good glimpse of what each field really entails.
I'd say Engineering is tougher. Starting with problem solving, Complex equations and all. In medicine, the formula is just to stay consistent with your books( thats quite cool if you love reading).
Check out the circuits on your Laptop, do you have a clue of whats going on in it? Or imagine how bridges have been built accross oceans, Not to mention engineers' Overwhelming contribution to the medical world.