Which iOS is better for iPhone 4 s - iOS 6.1.3,7.1.2,8.0.1?

Which iOS is better for iPhone 4 s - iOS 6.1.3,7.1.2,8.0.1?

7.1.2 is the best. Use it everyday.

It really doesn't mater when you already updated to a version, since you can't downgrade or update to a specific iOS. You HAVE to use it in your current one or update it to the most recent iOS for your device. IOS 7.x.x (any iOS 7 version) is "okay" for iPhone 4, and the most recent is iOS 7.1.2. This might run really slow on your device since iPhone since iPhone 4 is pretty old now but being updated to the most recent version is good since you get all the features and any bug is fixed. But the best running would be iOS 6.1.3.

And BTW iOS 8.0.1 isn't out yet, even iOS 8.0 isn't out yet (for all). Although Developers van get a Beta edition of iOS 8, and normal people might get it by registering UDID for iOS 8, iOS 8 isn't out for everyone yet. It will be out in September (i think so) for everyone. And iPhone 4 won't have iOS 8, so you can't get it on an iPhone 4.

Well, iOS 8 is the best since it's the latest, but it's not out for the general public yet. You can install it now if you register your device's UDID with a developer account through a site like http://www.udid.in/. It's $5, and then you can try the new OS before everyone else. That's how I got it on my 4s.