>>11652075Both. Stewart first, then Spivak.
Stewart's textbook outlines all of the elementary calculus from functions and limits to vector calculus and differential equations. He takes the time to lay out numerous examples in each section so that anyone who wants to truly understand the material and crank out answers like an engineer can do so.
Spivak presupposes that readers already possess a certain level of mathematical maturity and familiarity with math at a higher-than-high-school level. The priority is rigor, not relatability.
However, both textbooks are equally important in your intellectual journey. If you skip Spivak, you'll have a hard time reading Rudin or even baby Rudin when you study real analysis. If you skip Stewart, you'll have a very hard time solving rudimentary problems because your mind will want to justify every step before even getting started on a possible solution.
