I hardly used Touchwiz (I actually hate it) ... so if you really like Touchwiz then it will be a learning curve for you ... if you can work on Android independent of tools/launchers then its no big deal

---------- Post added at 11:17 AM ---------- Previous post was at 11:16 AM ----------

All I can say is that I think HTC is the only company which comes close to the fluidity and design sense of Apple (no pun intended!)
Current Devices : HTC One, iPhone 5
Retired : HTC Diamond2, HTC HD2, HTC Sensation XE, HTC Sensation XL 16GB, Motorola Razr, Galaxy S2, Galaxy Note, Xperia S, Xperia V, HOX+, HTC Butterfly, Galaxy S4