Do your research and take small steps. Watch all the videos for both pieces of software. Hearsay is fine, but it doesnt give you stick time. Also, before stepping out into any 3rd party app, know the default one (DJI Go 4) inside and out.
I have both of the others listed, though I have not had a chance to try out Autopilot. I am still going through the documentation and "flight school" for it.
The one thing I use in Litchi is it's Pano function. It is a fire and forget function. Set up the rows and columns, and hit go. Waypoints are nice, and I need to dig further into them. I used DJI Go's Waypoints to fly the same route 3 times to get a good comparison between D-Cinelike, None and True Color. It worked out well, and gave me a flight path that was 99% the same all the way around. Litchi kept going off course towards the end, leaving me with too much stray footage. Have to look into that.
For Autopilot, Zipline looks like something I will use more than anything else.