What exactly do I like in "aggressive" girls?

I think it depends on how much choice you have with women. If you know you have choice, like you could go out tonight and bed two women you are attracted to if you wanted, then I think you're genuinely attracted to aggressive women. It's just your thing and that's OK. However, if you do not have the kind of choice I described, then I think you have some kind of unresolved mommy or confidence issues.