I would echo what most have said above.
My opinions in a nutshell
DJI simply is the only option if you want decent photos at this time.
Phantom 4 Pro- Awesome machine with the pro version 1" sensor really good but size along with the other phantoms is not small.
Mavic Pro - Really good camera ,(not as good as Phantom 4 pro) fold up so it is smaller than Phantom
Mavic Pro II - as good as the Phantom 4 if not better but more costly from what I've seen folds up nice
Mavic Air - What I currently have arguably better camera than Mavic Pro I but not as good as Mavic Pro II or Phantom 4 Pro (slightly less range that you won't notice if you follow CASA rules only if you go for range tests beyond 4k lol)
Spark - Toy,,, works but camera is 1080p
Older Phantoms ok but no where near today's stuff
Bear