How is difficulty ranked amongst different engineering majors?

Out of curiosity, I was wondering how different engineering majors are typically ranked in terms of difficulty? I understand that it's largely subjective and depends on individual strengths, but I'm primarily interested in the general perception.

Engineering is indeed a broad discipline, consisting of numerous subfields, each having its own unique challenges and demands. You're absolutely right that perceived difficulty can be largely subjective, as it significantly depends on a person's natural aptitude, skills, and engaging interest in a given field. Nonetheless, here's a broad, high-level overview based on what is often generally considered.

Petroleum, Chemical, and Aerospace Engineering are often grouped among the more technically challenging engineering disciplines due to the intensity of the coursework which includes complex concepts and calculations. Notably, Aerospace Engineering is known for being rigorous since it often involves advanced physics, and high levels of mathematics in addition to engineering principles.

Electrical and Computer Engineering, although not exceptionally math-heavy, are considered difficult due to the abstract nature of many concepts that are far removed from everyday intuition and their fast-paced evolving technologies.

Mechanical, Civil, and Environmental Engineering can be very demanding and challenging as well. For instance, Mechanical Engineering consists of a broad range of topics (like thermodynamics, meshing, control systems), while Civil and Environmental Engineering substantial involve structures, materials, and physics.

Biomedical Engineering is another challenging field because it often requires a diverse understanding of not just engineering principles but also biology and medicine.

Industrial and Systems Engineering is often considered slightly "easier". This doesn't mean it's lackluster — it's just less about hardcore physics and calculus and more centered around optimization, systems, and processes.

Keep in mind, these are broad generalizations. Ultimately, the "difficulty" of an engineering discipline largely depends on an individual's strengths and keen interest. For example, if someone has a passion for learning how machines work, they could find Mechanical Engineering engaging and not necessarily 'difficult'. In contrast, one might find Industrial Engineering challenging if they struggle with concepts related to systems process and optimization. Remember, choosing a discipline should align more with your career goals and passion for the subject rather than perceived difficulty.