I've quite recently became interested in ancient battles and currently I'm focusing on the Battle at Cannae, but I have a few things is unclear to me and I was hoping for an answer here.

• Who is telling the more accurate story, Polybius or Livy? The numbers differ quite a lot between those two

• Is there any other source from that era who I can look up? Seems like most people either follow Polybius or Livy.

• Is there any evidence where the current battle happened and is there a certain area where it happened?

Thanks beforehand!