I currently have an Android ZTE something and it sucks, BUT I also use an iPod Tough 5th Gen. Together they make the perfect iPhone 4 lol
Really though I think Apple still holds the market in good smartphones, but some of the iOS updates they release are ridiculous. IOS 9 pretty much disabled my iPod but my friend's iPhone 6th Gen is working better for him now.
Before I did a factory reset (which btw I had to do for my HP laptop after that Windows 10 crap, but that's a story for another day) I was able to get it back to normal. As in the battery DOESN'T DRAIN while it sits in my pocket.