I used my tab 2 samsung galaxy (ok old but it did work) very very laggy. my samsung galaxy s4 active overheated in summer and I had to put it under water to cool down and continue working. after the samsung broke down on me (not because the water) my friend leant me an iPhone 5S which has absolutely no noticeable latency at all. my samsung was ok until the CPU was close to melt down

lol
I would like it is said above, try with what you have and if that is not good get what is.
EDIT: DJI did develope for apple devices in first place which is also stated on the package of a new inspire so I think in general an apple product is what one should get. I will eventually go for an iPAD Air 2 or the monster version with a 3D printed bracket

- but most probable the Air 2. these are reported to go flawlessly.
my 2c