i love my samsung, so that's my vote. hate apple so that's not my vote. had HTC wildfire before and no problems with it at all but prefer the samsungs :-)
I've heard the IPhone is really slow compared to other smart phones. I've got a HTC which is ok though I do miss some of the iPhone functions (had a 3G before). I can't remember why I chose the HTC over the Samsung, something to do with the camera maybe.
The HTC & Samsung run Android - a Google product. It's perfectly good, but you might find app inconsistencies annoying.
If you're a technophobe I cannot recommend the iPhone highly enough - it's limited enough in certain ways for you to avoid destroying it/yourself/your reputation.
Samsung runs on Google's Android but there are problems between the two companies. Samsung get Android virtually free and make all the money, while Google develop it but make nothing from it. Google have slowed development of the OS and are dropping Android from there own marketing. The Android App store is now Google Play and they have dropped Android from their latest Google TV offering. Meanwhile, Samsung have developed their own phone OS, Tizen.
Which means you should be wary of investing in a phone and content if upheaval is imminent. You don't want to buy a load of Android apps and then Samsung drop Android (or Google drop Samsung).
I'm in exactly the same postion - I should have upgraded last November but just cannot decide
I think I am verying towards the iphone as I have one at the moment and one son always says there must be a reason why the iphone is the best seller