Infrared (remote controls), all share, some photo quality (camera) although still good, some widgets, radio app, Etc. Despite lacking these, you can still download excellent alternatives.
With cm you have far better performance and battery life, better graphics, more memory, more customisation and last but not least, 1337 (you become awesome +1).
Oh and by the way I'm drunk.
Stock can be great on s4 mini because the phone is powerful anyway. Download cm for a bit of extra "oomph" and "oooo". Plus, your mum approves.
Sent from my GT-I9195 using Tapatalk 2