New Iphone --- Apple or Other?

I got the I phone only because my kids had it and could help me use it. After using it for a year I really like the smart phone especially for travel, between the live GPS systems like Copilot, the live traffic updates like Waze, avoiding storms like Weather Bug and finding gas like Gas Buddy. The two things that I don't like about my Apple I phone is that you can't install more memory and you can't change the batteries. I helped my BIL get a smart phone last week . I got him the Samsung (Android) phone because his kids had the Androids, for $150 which had more memory than my I phone which was expandable and a replaceable battery. I still get confused because the I phone doesn't have the back button like my lap top or the Androids. The I phones were much more expensive and no rebates. Either way once you learn how to use it you will like either system.