The discussion centers on the suitability of Stewart's calculus book as a first textbook for calculus. While some users find it adequate, others suggest there are superior options available that offer deeper explanations, more proofs, and practical applications, particularly in physics. Several alternative texts are recommended, including Comenetz's "Elements of Calculus," Spivak, Apostol, Courant, and others, each bringing unique perspectives and teaching styles. The conversation emphasizes that different books cater to varying educational goals and author expertise, highlighting the importance of selecting a text that aligns with the learner's needs.