Well, I guess Matilda won by the virtue of her son (Henry II) succeeding Stephen and turning out to be a great king who oversaw the birth of English Common Law
Stephen would have been a good monarch. He lost his son who would have ruled after him. The result was that he agreed to give it to Henry the 2nd. Who managed to mess it all up with his constant feud within his family. That family feud lasted just about 300 years.
Of all the Plantagenets, there were but only about three who could have been called good monarchs.
“From the Devil we came and to the Devil we shall go.”