If this is Savitar in the speedforce prison aka the one we see up until episode 15 of Season 3 then he wins. No one could see him, he was far faster then the flash and moved at a blur to him during debut.
He could travel in and out of the speedforce across Central City/Likely where he pleased, bent a man in half and was far beyond Barry, Jay and Wally at the time. He also did throw Barry around like he was nothing during Episode 9.
However if this is post Speedforce prison then Faora could take it. He can be seen, isn't as fast as he was and overall seemed weaker then before. While he's still faster then Barry and stronger it'd likely be more difficult to beat her.