Hi Brent,
Each of us has their preference re processing AVis. I tried everything I could find on the Net before settling on my current combo. Registax was great be my computer was struggling with large AVIs. Autostakkert is the fastest and the easiest but not the best for Lunar AVIs in my experience. But I use it for planetary as I fond it better than both Registax and Avistack. It's a question of what you feel most comfortable with.
The main thing is to have fun.
Eric