I'm going to say it outright- the sleep haze bomb, Torpor Tantrum, SHOULD outclass shivermist buster at most things. I believe Vana is immune to sleep however, so shiver should stay relatively well in the meta as the easy way out of duke for bombers and newer players, but for everything else, Torpor.
Upsides to Torpor:
-They CANNOT attack you
-It lasts a long time, letting you get out a good attack
-It stacks with freeze beautifully
-Can stack it with fire, shock, etc.
-Can inflict sleep upon freeze themed enemies, whereas shiver cannot. (Heart of Ice, anyone?)
-Wolvers do not teleport when attacked at if asleep
Downsides to Torpor:
-Cannot reinflict directly after they wake up to sleep-lock enemies
-Takes a small amount of time for enemies to fall asleep; their animation finishes
-Doesn't effect construct
-Doesn't effect ANY turrets, as all turrets share status resists with gun puppies, a construct
-Doesn't effect Vanaduke at all, so no shiver replacement
is that I keep seeing people that dislike how it regens health on some enemies. Though, in my own opinion, I think that isn't much of a downside. The health regen doesn't always happen and it's not that much health. So the bomb is still very useful. Especially in LD.