I can't choose between iPhone 4s or Xperia P?

I have two phones right now but I can only keep one. I have the iPhone 4s with IOS
7.1.1 and I have a Sony Xperia P with android 4.1.2. I can only keep one and I can't decide. The Xperia P is a little bit slower then the iPhone but I like how you can customize android more. On the other hand the iPhone is not so customizible but it is generally faster and I can really type fast on the iPhone like on whatsapp. I'm gonna use the phone for browsing, playing some games not alot, whatsapping and watching youtube videos. I noticed that when I watched the same youtube video on both phones that the quality is slightly sharper on the iPhone 4s, where as the xperia p is brighter.(I used the youtube app on both and chose a hd video)But wich phone should I keep in the end? I have to choose.

I guess just get what you think you would honestly like

Is iPhone 32GB or 16GB or 8GB? If it's 16GB or more then you should definitely choose the iPhone.
I suggest you to decide considering the value (price) of the phones.