CS70 Section 1 vs Section 2

<p>So there are 2 sections for CS70
one's 3 hours per week, for 150 students
the other one's 4 hours per week, for 30 students only</p>

<p>So according to the description, "Section 2 is an alternative, expanded version of Computer Science 70 intended to eventually become the single course on discrete math, probability, and statistics for all of EECS undergraduates."</p>

<p>Does anyone know what that means?
Can anyone tell me which one should I take?
Thanks</p>