Either drone will work just fine, it all comes down to the deliverables at the end of the day and both are more than capabile. It might come down to what you want to spend on your initial investment where the mini is much less than the Mavic 3...
Both of us already know that the video output that comes straight out of both types of drone is fantastic quality, same goes for knowing it's best to use smaller drones for the tight spaces and up-close-and-personal shots.
What it boils down to...