Debate which friend is more rational for Romeo at this point.

Benvolio is the only friend I see in this scene. Still I'd say Benvolio is the most rational out of all of them. Benvolio is pretty reasonable. He sees Romeo is obsessing about Rosaline and wants him to forget about her. Rosaline is obviously not interested in him so he should start looking at other girls. Benvolio also was the one who tried to keep the piece during the brawl at the market.