Gerard Whately, by a country mile. I believe this guy cut his teeth on horse racing, and it shows. His description of the action is precise and first class. He gets a heap of description into a few, well chosen words. Heard him recently on radio broadcasting the cricket. He actually described what was happening. These days, so many of the comentators are so full of themselves that they just prattle on with whatever's on their mind, and totally ignore the action on the field.