Which is better an Android Phone or IPhone 5?

I have never used an Iphone but have used a few Android Phones.
I'm planning to get a new smartphone. So what to do? Stay with android or buy ios device? Please mention pros and cons of these two and suggest for a best Mobile OS in your opinion.

Why can't i download files on my iPhone?

I have a iPhone 5 and i can't seem to download files from Safari. I can download apps from the app store.
Does Safari even support file downloads?
Is there any other way where i can download files like videos, music, pictures?

What would I need to replace in my iPhone for water damage?

Don't say the whole phone cause I want to try and sort it out my self I know it's braking iPhone terms and conditions and they no longer have anything to do with it I was just wondering what I would need for one? As I know they don't sort water damage they just give you a new phone so what do I need to replace?

Can I trade in my iPhone 5 for?

Can I trade in my iPhone 5 for a iPhone 4S for free while still on contract? It's in perfect condition but it uses so much more data than my old iPhone 4 and I just can't afford it considering I do not have Wi-Fi at home. I'm wanting to trade it in for a iPhone 4S if possible. Can I? Or am I just going to have to find someone to trade with me?

IPhone 4 won't recognize it's charging?

It was at about 9% last night and i plugged it into the charger and went to sleep. I woke up and found my phone completely dead and i tried to charge it but it won't even recognize that it's plugged in. There's no vibrate, no empty battery sign telling me to plug my phone in, there's nothing. I've used 4 different chargers too so i know it's not a charger problem, it's a phone problem. I also even tried plugging it into my computer but, again, it won't recognize that it's plugged in. The phone is completely dead. FYI: i don't use my phone for much at all, just for calls, emails, and texts, occasionally my little sister likes to play games on there but that's it.

please someone help me?

Can you download apps on an iphone if?

They aren't on the apps store? Well i'm trying to download an emulator to play nintendo games and it goes up to 99% complete then it says 'this can't download at this time' i wasn't expecting it too work but can i still download apps?