Hashirama isn't necessarily better. This is a Nine Tails team after all. }: |

For starters, the team mates are Guy and Eight Gates Lee. Their standards are pure taijutsu, so Hashirama's ninjutsu boost passive is useless to them.

Also, while it is true that Hashirama's barrier can boost Guy as well unlike Yamato's which can only boost Lee, I would think that Yamato's star power and passive should be enough to make up for or surpass the damage missing from Guy + Hashirama's barrier.