Been watching some older races (2001-2003 era) on YouTube for nostalgia reasons. Not only were the races better, but Fox's coverage in the early 2000s was the gold standard. Everything was so great. Graphics, commentary, music, pit reporters, camera angles, production... everything.
I was partial to NBC back then because I LOVED the Bestwick/BP/Dallenbach trio in the booth, but Fox's coverage as a whole is easily the best television coverage the sport has ever had.
As for NBC, today... I still don't have any complaints. I also haven't watched a complete NASCAR race in over a month. Have New Hampshire on the DVR. Will put it on when I climb in bed since that's what NASCAR racing is good for these days.