Radio usually is more exciting because the play-by-play caller can make it sound that way. And the listener isn't seeing what's actually taking place so a picture is formed in the mind. Not saying that's bad.
That, and they're describing what is actually going on, on the track. Meanwhile, on TV you're watching a closeup view on the top two running nose to tail.
It was mentioned on another thread yesterday how DirecTV was carrying the MRN feed of the race while displaying the in-car view as well as the network view. During the commercials I tuned into Dale Jr. channel. At one point after they were all running single file for a while, they started to make moves at the back of the pack to get to the front. From some of the camera angles, this could be see from time to time but it was never even mentioned on the broadcast until the line was approaching the top 10. They were missing everything on television. I've said it before and I'll say it again, television will never do this sport justice. As long as they keep their coverage zoomed in on individual cars all day long, most of the action will and is being missed. You know this if you go to a race. I've never been to a bad race but I've seen many of them on TV. I record every race that I attend and watch it at some point after I get home. It's always a different race.