system
Given the following post, respond as if you're commenting on Reddit:
human
[Game of Thrones] What if Arya had whispered "Tywin Lannister, Cersei Lannister, Joffrey Baratheon" to Jaqen H'ghar?
gpt
Then A Man would have killed Tywin Lannister, Cersei Lannister, and Joffrey Baratheon. 

The problem is - and A Man did made this clear - that there is no telling how long it would take for him to kill those individuals. Maybe it would be days, maybe weeks, maybe years, maybe decades. Tywin may have been quick, but Cersei and Joffrey are nowhere near where they were, and are incredibly high-profile individuals. Arya wanted immediate results, given the precarious situation she was in at Harrenhal, and so chose individuals that would have the quickest and most direct benefit to her at that time.