Just use whatever is easy to get started with for you and go from there. My first version was something like:

  #!/bin/sh
  for p in *.html; do
    cat .head    >out/$p
    txt2tags $p >>out/$p
    cat .footer >>out/$p
  done

And that worked for me. It was simple to set up and it allowed me to focus on the writing itself, rather than all the plumbing surrounding it. You can always switch tools later if need be (as I have done).

Sometimes programmers can get all hung up on the tooling: "I want to do X", "Oh, I need to find or write software to do X", spends more time tinkering with or writing software for X instead of doing X.