Are there some styles that may be better against multiple opponents than other? yes. However, I believe that it's not a certain set of moves that allow you to engage multiple opponents. Rather it's you having experience and being proficient enough to engage multiple opponent with which ever style you are trained in. In the end, I say it comes down to speed, technique, and luck.
Oh! and it also helps to knock out your opponent in one move so that they don't rejoin the fight.
EDIT: katas may not be useful in a self-defense situation, since your responce is dictated by your opponents attack. And since katas respond to a pre determined, invisible attack, your opponent may not respond the same way, rendering the kata useless. Of course, katas do build muscle memory, so that might help you out.
I don't know about other fighting styles, but I know that krav maga does some training against multiple opponents.