I didn't watch the video in OP, but as someone who was born in the early 90s in NYC, I can totally see why some might think Fab is better than Nas as a rapper.
Nas run as a mainstream rapper was pretty much over after God Son. One of the singles for Streets Disciple was "Virgo" and Nas is one of my GOATS but my god, Virgo is a awful song

I remember listening to that as a teenager and turning that shyt off after a few seconds
Just A Moment is a great song, however it's also depressing AF and is too heavy subject matter wise to bump regularly if you are a happy teenager.
If you came of age in the 2000s, Fab was just looked at as cooler than Nas
Now, I prefer Nas music over Fab but I can totally understand why someone of a certain age prefer Fab music. I think the vast majority of hardcore Nas stans on here was a teenager or older in 94 - 02.