This is a question that cannot easily be answered. There are certain advantages of an Android and vice versa. Here are some examples to help you decide for yourself:
- iOS has more timely updates that Android. In some Android-based phones, users only receive one major update in the phone's lifespan, whereas iOS is constantly getting helpful updates. 
- In general, apps tend to run better on an Android device. With iOS phones, apps tend to crash or not function properly. 
- iOS phones tend to be less likely to get malware, mainly because it does not allow third-party app stores. It also has a strict method of preventing apps with malware from entering the app store. 
- Android phones tend to be cheaper, in general, and not just for the cost of the phone as a whole. Accessories for iOS phones are usually more expensive than those for iOS phones. 
- iOS phones have Touch ID. This means the only way for your phone to unlock and function properly is by using your fingerprint. The only kinds of Android phones to have this are Samsungs.