Definitely AP Algebra (1)^2.
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Calculus; by a long shot.
no
Opinion: Calculus is much harder, mostly because of it's complexity. Calculus requires much more formula memorization and ingenuity.
The answer depends very much on your aptitude, and possibly your interest: there are no absolutes. Some people find calculus easy but not linear algebra and others are the opposite.
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.