What’s the difference between service analytics and the report builder?

Service analytics has out-of-the-box reports; the report builder requires you to build every report from scratch.
The report builder has out-of-the-box reports; service analytics requires you to build every report from scratch.
Service analytics has in-depth reports; the report builder has more generalized reports.
Service analytics is generally for managers; report builder is for reps.

The correct answer is:

Service analytics has out-of-the-box reports; the report builder requires you to build every report from scratch.