I would say Windows Phone just because I personally prefer the panoramic, text-heavy design with the default predominately black background as opposed to Apple's style.
Depending on what you rate personally higher, many would say iOS alone simply because of the bad(catastrophic) rehash of Xbox Music player and iOS music player being the most widely used base app.
IOS, stopwatch with timer built in. Also mms allows you to scroll through images, WP you have to return to the message and click the next image. Design goes to WP though. IOS reminds me of messy desktops with a bazillion shortcuts.