Saurus warriors has 1 wound, 5+ save, 2 attacks (weapon and jaws). Saurus knights has 2 wounds, 5+ save, 4 attacks. So, they are nearly close. But they have one small advantage - movement. And, with firehost, it seems like on 6 they deal 2 mortal wounds (1 for blazing cohort, 1 for blazing lances). With starseer it is 2 mortal wounds on 5+. 10 guys can make 6 mortal wounds on average.