To each user the experience varies.
The NX5 modem is by far the best of the clutch available for this device...I get better signal strength, faster handoffs for WiFi, far better WiFi reach, just a superior user experience.
But, as one may imagine, there are so many variables that it's well nigh impossible to isolate that which is best for you.
Best thing about having this terrific engineering bootloader, the ability to flash even the jellybean MJ4 modem...
https://www.dropbox.com/s/m00o8zdhoqanl11/N900PVPUBMJ4_Modem.tar
Sent from my SM-N900P using Tapatalk
Where did you find an NX5 modem, or did you mean NC5?