I had to switch from an iPhone to a Galaxy S4 for a trip recently. Though there were some upsides, I lost count of how many points of inferiority and annoyance I noted while using it. I'm more than a little biased, but if I can have both what I perceive as a far better phone and openness, I don't want to settle for one or the other.
Then again, I haven't used a jailbreak for anything significant in a long time, so for me, the openness is more in theory.
TouchWiz is terrible. It's bloated, riddled with security holes, and doesn't follow the android UI guidelines. Users with TouchWiz are missing out on the the majority of design improvements android has had in the last 3 years.
Try out an AOSP based build (maybe the ROM from the google play edition?) on your phone. It's like night and day.
Swype sucks if you use a lot of acronyms. Most of my work emails involve such. The iOS keyboard is really good at hunt/peck typing which is what's needed for such terse communications.
Swype causes keyboard popup delay of several hundred milliseconds on my N5. I stopped using it after 3 days.
Also what's with the default throb on key press in Android? Why would anyone find that useful?
Then again, I haven't used a jailbreak for anything significant in a long time, so for me, the openness is more in theory.