I wasn't very familiar with Flight Plan until you brought it up here. So I looked it up and now can speak to your question.
Without a doubt, unless you're doing "mapping" I would strongly suggest Litchi as the choice. It has been around for awhile and has SO many features for a $25 app. Litchi, for the most part, can do most of what Go4 of the DJI Fly app can do and is a reasonable substitute if you like it. Yeah, Litchi more expensive than Flight Plan, but worth every penny. I'm going to skip over the obvious features such as creating a waypoint mission on your phone or tablet.
1) Litchi allows you to plan and virtually fly automated missions planned out on your computer for the comfort of your computer chair. It gives you the opportunity to see what you're programmed, fly it on the computer and tweak it before you actually go out to fly. Their "mission hub" where you program your mission also has thousands of missions you can look at and use or modify for your own- from all over the world. That should blow your mind in and of itself. Of course you can program waypoints on site on your tablet or phone, but the computer mission programming is something else. [see bottom photos]
2) FPV capability with inexpensive VR
goggles! You can fly FPV and be immersed in flight with a $20 pair of VR
goggles. While you legally need to have another person to be a visual observer when you do this, it is a real kick. For me flying VR through and around stuff is a totally different experience than watching my phone or tablet.
Below is a screen shot of a planned mission that I have not yet flown. Below (or beside) that on is a screen shot of my computer illustrating part of what I'm seeing "in virtual flight". All other features aside, I think this illustrates one of the great Litchi features.
Now, if you like this and you have a good handle on programming, another program to look at is Drone Link. It has the pre-programming features of Litchi, but doing so is far more technical, but can be tweaked to a finer degree relative to where the camera is pointed as well as stopping and stopping filming. I've got it, but it's been over my head. Just thought I'd throw that other option out there. I'm not familiar with DroneLink's other features. I'm not sure if it supports the
Mini 2 yet.
That's all I got for now. Good luck.
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