Hi Flex
Its definately neither Mirasol or Twilight, the Mirasol has a different growth pattern and pod shape to those in the pic. The foliage is no indicator at all, there are just so many varieties out there that its impossible to make this sort of identification.
Whatever it is it looks nice to me and you seem to be enjoying it, so I would not worry about it too much. Where did the seeds come from in any case, it may wll be a hybrid from a friend or something if you do not know what it is supposed to be.
All the best
Guy