I don't think there's a clear winner. The toxicity of Euphorbia juice also varies depending on the recipient.
These plants are named for their poisonous/irritating properties.
The first one is native to the region, the second one is part of a group of about 5 West African Euphorbias with similar properties (including unispina, poissonii, and a couple more). Its name means "poison-making"; this and others in the group were used by locals as a pesticide.
This plant is named for its highly toxic sap
and one of the active ingredients has a very specific mode of action like hot chile peppers, only 1000x as strong.
https://en.wikipedia.org/wiki/...
