Though I enjoy Behemoth's early black metal material like From the Pagan Vastlands and FOrests Dream Eternally. Satanica is good, but everything after gets a huge stamp of boedom.
Nile's first three full lengths are all great, though.
behemoth has never released anything as good as ITDS, though I enjoy Zus Kia Cultus and their new one, apostacy kicks massive amounts of ass. Nile wins it for me but its close