I think Sue Bird is the most intriguing choice among all of the UConn alumnae. I don't see Diana as a coach -- I doubt that she could communicate how to play to someone with a lot less talent that she had (just like Willie Mays and Ted Williams couldn't teach hitting, and Sandy Koufax couldn't teach pitching).
I think Sue and Jenn are the two most likely to approximate Geno's encyclopedic knowledge of the X's and O's of the game -- I'm not sure that Shea or Marisa could ever do that. Of the two, I would think Sue would be on a different level because she has seen all that international, WNBA, and Olympic basketball -- quite a different level than America East.
Having seen clips of Sue chewing out Lauren Jackson during Seattle timeouts, I think she could handle the challenge-and-discipline aspect of the game as well as Jenn or anyone else. She certainly would not be intimidated by anyone's talent level.
Also, recruits know her name and her reputation, and (while they know Jenn's also) I suspect that they will be more impressed (perhaps awed) by Sue's accomplishments.
Last but not least (actually it is least), she presents a very eye-friendly public image for at least 50% of the potential audience!