there is not much of a difference between most of the android phones. the HTC one has a slightly better feel to it and build quality, being that it is made from aluminium rather than plastic.
However, the camera on the Galaxy S4 is much clearer and more crisp than the HTC offering, so this may be a consideration for you too (although possibly not?).
There are good deals to be had on the iphone 5 as well, being that the iphon 5s/6 is only about a month or so away, so thats another option to think about