Actually, I heard NSF GRF may be more prestigious compared to NDSEG, since many academics know that the NSF award is more heavily weighted on one's proposal in addition to accomplishments. On the other hand, fewer people receive NDSEG, so in that sense, yes, it may stand out more. Of course, the extra money that NDSEG gives is nice too.
But for the record, I'm just a disinterested voice in the crowd, as I am not on the waitlist for this award.