Tax Accounting or Forensic Accounting?

I am a student of Assocaites and was planning to do my majors in accounting to become a tax accountant but last night my management class teacher told me about Forensic Accounting which I did not knew about and now I am all confused again
Which one is better Tax or Forensic?
Which one will be harder or take more time to complete?
Which one is more rewarding and enjoy more job security and demand?

Thanks in Advance