Well, the huge battles in smartphone software tech is either Android or Ios, i stand by Android side for a few reasons
1) Customization : , allows huge customization and the OEM of android based phones are fairly easy to unclock and try new ROMs
2) User Interface  : Commonly known as UI in Android is perfect for any user be it a new child or an old man, they will love it
3) Updates : Well everyone knows the craze behind android version updates, it just sets in a new trend,
in such ways Android is above Ios,
but still Ios is known for its great security too
Choose wisely