You mean from normal practice in relative clauses? Yeah, I think の probably is more common. But I meant when you take a sentence and turn it into a modifying clause you can replace が with の.
In the case of a relative clause, my understanding is that が emphasizes the word directly before and の points more to what comes after. On the other hand, it's probably a very subtle, academic distinction lost on most native speakers.
あまり気にしなくてもよいね。