Calculus; by a long shot.
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Opinion: Calculus is much harder, mostly because of it's complexity. Calculus requires much more formula memorization and ingenuity.
Just about all of calculus is based on differential and integral calculus, including Calculus 1! However, Calculus 1 is more likely to cover differential calculus, with integral calculus soon after. So there really isn't a right answer for this question.
Vector calculus is applied in electrical engineering especially with the use of electromagnetics. It is also applied in fluid dynamics, as well as statics.
All electronic devices would not exist without calculus. Engineers would be able to do nothing without calculus, which means everything that we have that we owe to engineers, we owe to calculus as well. Physics would not exist beyond the high school level (which is trigonometry based) without calculus. If you asked this question to help you with a school assignment, here's a good common saying you can use: Calculus is the language of physics. Applied chemistry requires calculus, which means that everything that we owe to applied chemistry, we also owe to calculus.