Six Engine vs FF6 SDK

While this is a forum focused on modding and hacking Final Fantasy VI, many here are also interested in creating their own Final Fantasy VI-style fan game, beyond the limitations of a ROM. I was wondering what the best tool for doing this would be.

I know Six Engine and FF6 SDK are two completely divergent approaches to recreating a FF6-like environment. What I am wondering if anyone has had experience with both tools and which one would be better.