I always go for blings against either terran or zerg... but I swear they are useless against protoss. Even when I do hit the zealot ball dead on with blings... the damn things seem to survive. I go straight for roaches against protoss now
(Note, I always get metabolic boost for slings, and transition to lair with my next 100 gas)
My goal is always to keep the ground safe for long enough with usually minimal investment that I can pop out hydralisks in enough time to protect myself from air.

My goal is always to keep the ground safe for long enough with usually minimal investment that I can pop out hydralisks in enough time to protect myself from air.
Please give me a home where cloud buffalo roam
Where the dear and the strangers can play
Where sometimes is heard a discouraging word
But the skies are not stormy all day