My vote would be Bothrops asper. As well as (some) other lanceheads.
I have been told that encountering B.Asper in the wild, can be rather unforgiving. I have worked many bothrops species in captivity, along with elapids,(P.colletti.Dendroaspis ssp., Oxyuranus scutellatus,etc.) but they were NOT as predictable in behavior as B. asper.

As far as toxicity, canni wins hands down over asper. I thought the thread was most dangerous snake? A wild caught Retic from Vietnam should be considered also! LOL!

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