Let me know the reason you used AltSoftSerial library instead of SoftwareSerial's in drvier ?

I knew that Lora project such as SNIPE use SoftwareSerial library on driver in Arduino Uno.
Then I found that NB-IoT_Arduino project use AltSoftSerial library unlike Lora project, SNIPE.
Let me know the reason and difference in implementing a serial with each module between two projects.

Thanks in advance,