I have an original Phantom. First time it got moved in years was this weekend when I cleaned the garage. And back on the shelf it went.
I have two Typhoon H's. One with Real sense, one without. I've never flown the second. It's my spare in case I crash the first. I accomplished this by buying multiple and parting them out until the cost of the second was zero.
I have a Spark. I bought it because it was cheap (330 fly more). Bought a spare for this as well, but it is unopened and eventually will get sold when I get bothered enough to sell it.
Lastly I have an Air. My new one and I'm still getting used to it. I bought it because I got the fly more for 800 and managed to average that cost down to about 600. I bought it for Waypoints (thanks, DJI for removing it) as that is crucial for doing survey work and the H is kind of cumbersome to haul around.
There are things I love about all of them (minus the original Phantom). With the spark I can fly with abandon (if I wreck it I'm upset, but not that upset), but miss 4k video and the range/connections aren't the best. With the H I get more flight time, waypoints, decent (if not great) 4k video and don't need to worry about phone connection issues. The Air is a blast to fly (especially in sport mode), good pics and video, but for some reason I'm still getting used to it and it is harder to fly. The size of the air also makes it easy to travel with.
I also have some cheap $60 ones for my kids to practice with until they graduate to the Spark and on up.