Re: What players sound articulate/intelligent , others not much so ?
To me Woz sounds very youthful. A kind of outgoing, jokey, pranky teenager.
If people are speaking a second language, I always assume they sound best in their native tongues, but I don't really know.
Vera comes off well-spoken and articulate, but not necessarily the most interesting speaker. Sveta, Sammy, Venus, Serena, Sharapova, Aga, etc., they are all well-spoken. Kim is a little bit repetitive, but, again, maybe in Dutch/Flemish she's not so. I don't know.
I think most of the players come off rather well in interviews, in keeping with their own personality.