If you're using Android, you're free to do whatever you want.If you're using iOS, you get updates for many years.It comes down to personal preferences.
Can't really give proper arguments about this since I never owned an iOS device (never wanted to) due to my satisfaction with the simplicity of the Android system.
Grapes are sour
As far I am Android developer, I would recommend Android . I hate apple because it is very expensive but useless as: