I prefer Android. I find it much faster to jump between tasks, and it feels like it's been fairly well thought out for the most part. I had an iPhone previously and it felt like it just had so many obvious omissions, and I grew to hate Apple's iTunes store dictatorship and how god damn difficult it was to even just transfer basic things like contacts and files without connecting it to a computer. Android at least doesn't require a USB relationship with a computer in order to function properly.