>Tyranids only win through sheer numbers
No they don't? Its one of the easiest ways for them to win, but they deploy Lictors to hunt down key personal, Raveners and stealers to hit supply lines.
While its true tyranids do outnumber the zerg, its also true that most their "equivelants" are also stronger. Gaunts are bigger, more armoured, more numerous and likely faster. Heck genestealers can rip into tanks with ease, keep pace with marines and weight a whopping 300kgs, yet they can silently stalk with ease.
>Kerrigan OP as fuck
Granted, but going off of fluff, she is no more powerful than any alpha level psyker
>ultralisks are way bigger than biotitans and can be spawned rather quickly
Even going off your pic.. no they aren't
>reproduce faster
Tyranids can reinforce in the billions within a matter of hours, guess what, in starcraft the Tiamat brood was known for being the most numerous brood of all the zerg, it had at its peak 6.5 million, that's the whole fleet, that's an hourly wave for the nids
>don't need biomass, only minerals
Neither do nids? They eat metal, minerals, earth, water, air, they taken TRILLIONS of tonnes of water and earth from the planet and reconstitute it
Leviathans are big, but honestly go look at the hive ship sizes, they dwarf imperial ships, which are themselves a handful of KMS long
Gameplay purposes do not count, much like table top purposes. The fluff matters more