My philosophy is that if you enjoy all of them and they have similar prospects, then it doesn't really matter :-) It seems you've done enough research to know whether you'll really enjoy it. Perhaps all the choices are good choices.
I've also chosen paths just because they were/seemed more difficult, like it seems you are proposing. It was interesting, but I would not do it the same way again. All the options would have allowed me to challenge myself by trying to excel.
- Look at current and future opportunities.
- Consider what you enjoy working on.
- There may not be one best path, there could be multiple.