Well, in KOF 2003, Adelheid is I'd say maybe 20, while Rock is roughly 11-12 maybe? I dunno when MOTW takes place. You might as well just ask the guestion: Who'd win in a fight, Geese or Rugal? Whoever wins that fight pretty much seals whos offspring would win.
So that would make Rock about 13 or so. I still think that's kinda young to be fighting against people like Kyo and Yamazaki. I think Chris was around 14 or so (still seems to young to me). Stupid Bao. So at this point, Rock probably doesn't have very many of his skills developed, and Adelheid would win. But if it was MOTW Rock, well then. Who knows? I still think Adelheid would win. Rock does have Raging Storm and Neo Deadly Rave. I have no idea now. Should of made a poll.