Well since there is absolutely no comparison nowadays between NJA and Major airlines let’s just say from now on all comparisons are regionals vs NJA when the phrase 121 is used.
It’s most likely more realistic anyway, they both are a stepping stone to the majors. I don’t mean any disrespect since you can make a good living at both but you see people leave NJA/Regionals for Major airlines you do NOT see the flow going the other way unless it’s age 65.