I am in high school and have no access to a professor or anyone. I previously used

Calculus Volume Iby Tom Apostol and Spivak’sCalculus(for the differential calculus bit).I can choose between

Mathematical Analysis by Tom Apostol andPrinciples of Mathematical Analysisby Walter Rudin, as I was gifted Rudin by a friend and ended up buying Apostol as well. I will be indebted if someone told me which one is the tougher one and which one is better for the self-learner. I have no issues about how tough the book is, but I would like the book that enables me to understand the subject better without being too compressed or too verbose and guides me better.

**Answer**

The best advice I can give you is to do what I did when learning real analysis: **Use them both.** Apostol has a far better exposition, but his exercises are not really challenging. Rudin is the converse — superb exercises, but dry and sometimes uninformative exposition. The 2 books really complement each other very well — especially if you’re self-learning.

**Attribution***Source : Link , Question Author : Eisen , Answer Author : Rudy the Reindeer*