Long Bardiche is very good but don't think it does rear horses, remember someone saying it is 1 unit too short (need to be 141+)
Theres only a few polearms that I think are complete trash or not worth using over something else, they have their uses or are balanced with cost. Most of the spears are pretty decent (even boar spear for 1.2k, cheap war spear), bamboo spear for length, military scythe or fauchard as cheap glaive type weapons, quarter staff, both lances, pike, long spear, war spear, battle fork. All pretty decent weapons