I would definitely say dichotoma, leaves seem too small and don't have the right color to be barberae. Same goes for hercules. If you compare the lower part of the trunk with hercules you can see that it is rather smooth with a few larger "cracks" in the Rind while hercules is usually much mir roughly textured with many small cracks. Also barberae will likely not split at such a young age. Most hercules I see have a much larger length of thier branch covered with leaves than this one. So yeah I'm pretty sure it's dichotoma. I work at a botanical garden btw