In the book Tangerine whos choices have the most significant consequence on paul fisher

Eric's choices have the most impact on Paul.

Explanation:

When they were little, Eric sprayed Paul's eyes, and Paul lot the periphery sight. Paul thought that he was blinded while staring in the sun, but it was Eric's action that influenced him. Those decisions at firs were hurting Paul, but at the time passing, those decisions made him stronger.