The S3 is not an iPhone. It's fully customizable, if you are having trouble getting around that means you aren't using the home screens properly. Try to organize a little bit, I have the apps I use most often on my home screen, then I have a screen dedicated to music, one dedicated to games, etc.
I barely use any of the stock Samsung or Android apps. You can generally find better ones in the app stores.
My battery life is fantastic. It took a little research and tinkering but I've customized my battery usage to fit my needs and preferences. For instance, I don't need to get emails the minute they are sent to me so I have an app that turns off mobile data while my screen is off and it saves tons of battery.
I can't help you out with the ring volume.
But yeah if you don't want to be able to customize your phone and you want a really loud ringer for whatever reason then maybe an iPhone is best for you. My guess is that since you're still new to android you're just not sure how to make the most of it.
What switches off the mobile data while screen is off? Data takes up such a massive amount of battery

