>TLDR: How do I get a coworker fired/ to work more I have

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>TLDR: How do I get a coworker fired/ to work more

I have reports showing:
>Employee A completes 10 tasks in 40 hours a week.
>Employee B completes 20 tasks in 20 hours a week, they're part time

So Employee A literally works at 25% the pace of Employee B.
>PROBLEM:
Employee A is their managers buddy, and the manager lets Employee A get away with anything.

So do I try to confront my boss about this with the quantifiable evidence (reports), OR write some grandiose email to HR about nepotism and time-theft and attach the reports for them to draw their own conclusions?

>BONUS: Employee C and D also regularly perform at 2-3x the efficiency of Employee A, and would both corroborate my concerns of time theft. Employee A can be documented on reports and cameras clocking in at 730am, but not working until after 11am. Also, stopping work in the afternoon and not clocking out until the evening.