The discussion centers on the difficulty comparison between aerospace engineering and mechanical engineering, asserting that each field has its unique challenges rather than one being categorically harder than the other. Participants emphasize that coursework in aerospace, mechanical, and electrical engineering can be comparably rigorous, with overlapping principles in areas like fluid mechanics and structural engineering. Aerospace engineering is described as a specialized branch of mechanical engineering, particularly in applications like jet engines. The conversation also highlights the importance of personal interest in choosing a major, suggesting that enjoyment of the subject matter is crucial for success. Ultimately, the consensus is that the perceived difficulty should not be the sole factor in deciding on an engineering discipline.