Zerg ZvP build

I have been playing for a couple weeks now (not a lot, been busy with warframe) and he=ave been pretty much using the same build in ZvP: fast exp, try to keep off early pressure with roaches and lings and then transitioning as fast as possible (safely) into swarm hosts, then corrupter and eventualy vipers. I always build an "just in case hydra den" after my lair is done for void rays.

Anyway, every once in a while I watch some streams (mostly while making homework) and I have been noticing a lot zergs going for hydra ling with some corrupters/mutas. Is my swarm host play bad, and if so, what is the broadly seen strongest build for this hyrdalisk based play?