Scully for sure. For those who may have heard them, Phil Rizzuto and Bill White were laugh out loud funny doing the Yankee games years ago. They worked with other partners, like Fran Healy and Frank Messer. They needed a third guy, because Rizzuto often disappeared after the 7th, to beat the George Washingon Bridge traffic back to New Jersey.
The best teams are those who can fill the time between pitches with stories, anecdotes, insights, etc. They make you feel like you're all in the seats at the park together, yakking about the game. Both NY teams' radio crews do that very well (yes, even Sterling-Waldman), as do Pat Hughes-Ron Santo of the Cubs.
And my surprising up-and-comer these days is is Ted Leitner
of the Padres. He has an old-fashioned rapid-fire delivery that reminds me a lot of Red Barber, without the corn-pone references, and would be right at home in New York. If you have XM radio or MLB on your iPhone, give him a listen sometimes.
And I hate to say it, because he will always be my favorite, but on the radio, Vin Scully is starting to rely too heavily on stats and less on the stories and florid descriptions. There are times I actually prefer listening to Charlie Steiner on the Dodgers' radio broadcasts. The slower pace of TV does seem to fit him better now.