Usually my philosophy in chess is to trade down then either win or draw in the endgame. Im playing black tomorrow against a school rival, do you have any suggestions for black openings? I would prefer an opening that can trade queens easily. Im better at endgames then openings, so i just get it even til the end. Usually as black ill play slav,semi-slav, or caro-kann. Any pointers or advice?

What would you consider the best black openings for playing against better opponents? should i stick with what im good with?

Yes. Of course.

If your playing to win, then stick with what your good with, If your playing for fun/to improve, try something new occasionally.