DroneDeploy works on the Inspire 2 (I used it on my last mapping job) and now specifically supports the X5S camera and various lenses when calculating flight path for resolution and overlap (I didn't use that version... I estimated from the X3 calcs.). Both the Inspire 1 and Inspire 2 are quite a bit larger than the Phantom. People use cases for flights.
There are no zoom lenses for the Phantoms, but there are for both Inspires. The Inspire 1 has the Z3 camera which does 3x optical zoom and 2.5x digital for a total of about 7:1 in 1080p. If you are shooting 4k video you still get the 3x optical zoom.
The Inspire 1's X5 and X5R cameras support both the Olympus m.Zuiko 14-42mm and the Panasonic 14-42mm micro 4/3 zooms. (So, 3:1 optical also) Neither are great lenses, but the Panasonic is a little better than the Oly. Really, when flying the micro4/3 system on the Inspires it's much better to use prime lenses and just switch them out when you need to change focal length.
The Inspire 2's X5S camera also supports these zoom lenses.
I have an Inspire 1 with the Z3 and an Inspire 2 with the X5S and a selection of lenses including the Olympus zoom.
For mapping the Phantom 4 Pro is equivalent, and maybe even better in quality to the Inspire 2 for all intents and purposes. The Inspire 2 will have better low light performance, but you shouldn't be doing mapping in low light anyway.
I haunt RCGroups. There's lots of good info about the aircraft and various software. It's a huge site covering everything from boats to kerosene burning jets. You'll find many sections about multirotors of all types.