When you say your dad has a past of anger issues, how far in the past was that? Do you think that he has worked through them and has changed enough now?
It makes sense in a way for you to be with your dad, but I do worry about anger problems and would not like to think of you possibly getting hurt.
Do you have another female relative that you could stay with for a while? Maybe just until your step mom gets over the split, as that could be why she is controlling and harsh. It's a hard time for all of you right now.
I can understand your dilemma but without knowing you or your family, it is difficult to suggest what would be best. This is why I think a third option, staying with another relative, might be the way forward, at least in the short term.
I'm sure your dad and step mom want the best for you and will understand the problem that you have in being with them right now. They too might need a little space to get their own heads around the split.
In the fullness of time though, it will be good to know that you have two people who love you and two homes that you will always be welcome in and can call your own.