Changing from iPhone to Samsung: wise move, or regretful decision?

I'm a second gen. IPhone user, my previous phone was a 3G, and I'm using a 4 since 2010. This summer, I was planning to change to iPhone 5, but as soon as I got my hands on it for a few days, I was totally disappointed. I didn't like its design, it felt like some cheap scrap material when holding it, and operating the phone wasn't so comfortable either(but of course it was much more faster than my good old 4 and it could make good quality, panorama photos). Then came 5S, which I thought will bring balance into the force. Well… No. I'm really not a paranoid person, but me giving an apple device my fingerprint was way too much for me, so I gave up on buying a new iPhone. However, I did check out the S3 when it came out and I liked it, despite its… Well… Cheap looking design(sorry S3 owners).It was way above the iPhone, even then. So there was no question whether my next phone shall be an S4 after the disappointing introduction of the new iPhone.

So here are my questions: Is changing from iPhone 4 to an S4 instead of an 5S a wise move?(I'm expecting answers regarding the hardware part, like the quality of the touch screen in the S4, maneuverability, etc.). Will I like the S4 more, than the 5S?

There's no one answer. Depends on how you use the phone and which ones you chose. First, make a list of how you want to be able to use the phone, including comparing available apps, storage space, expandable storage, etc.

The new IOS7 is causing a lot of problems, so that's something to think of.

Hardware isn't hugely different, software and available apps are the key.