both will be good enough for the default Ryze app.
As for custom apps:
The iPhone 6s will run TelloFpv and TelloMe with acceptable performance (this is my test device)
The S5 will most likely be OK for TelloFpv (test the free demo first) but too weak for TelloMe
Thanks for such a quick response!
had my first test flight... seems to be ok with the S5... works fine with Tello app and TelloFPV. Just need many hours of practice now!I have been using a Samsung S4 with TelloFpv. It works but a bit slow..!