User blog comment:Inquisitor dusk/tyranids vs flood/@comment-6078851-20130225165546

tyranids win, no contest.

the flood have no spaceships, or any technology for that matter, so the tyranids could simply obliterate them from orbit.

comparing the gravemind to the hive mind is like comparing a poodle to a kraken. also the hive mind isn't a corporeal entity so it could never be assimilated, and the hive mind, including many individual creatures, is highly psychic - the flood isn't.

lastly the flood are local to this galaxy whereas tyranids are an extra-galactic species who have consumed multiple galaxies worth of bio-mass. so even if the flood were a match for tyranids sheer volume of numbers would have tyranids stompng over everything :)

now don't think i'm biased, as a sci-fi species i think the flood are really cool but, as tyranids existed before halo i believe that the flood are really just a weak imitation of tyranids. i could be wrong though, it's just my opinion.