Personal mobile: iPhone 6S (replaced an iPhone 5)
Work mobile: Sony Xperia SP (replaced a hateful old Blackberry)
US Cell phone: HTC something or other
The Sony and HTC are Android and by choice I would take iOS over Android all day long. For work purposes the ability to install our own apps etc. makes it the OS of choice. In comparison to the current iPhone the other two are older and much slower. I suspect the latest Samsungs would be every bit as quick as the 6S though the cost won't be much less.
i purchased the 6S (128GB) whilst in the US on Black Friday last year and saved over £150 on the UK price and suspect the same proportionate saving could be made on other phones.