Radio is better suited for highlight calls. The description dominates. On TV, it's the picture that counts, with the sportscaster adding the captions. Radio is describing everything that takes place. TV is complementing the picture with identification, analysis, and comments.
TV leaves more time for creative effort, banter with a partner, and a more conversational approach.
Radio conveys more excitement because of its continual barrage of words, usually delivered with higher intensity, while TV realizes that one picture does say more than a thousand words. In either medium, having a good vocabulary is vital. Choosing the right word is an art. Being well versed in grammar used to be a paramount consideration. It no longer receives the same attention from viewers or listeners.