If you are above 230 kt use speed brakes. But only if you can't accelerate further, due to speed constraint.
Below 230 it's. Use gear. If you need to use speed rake as well, it's time to rethink your energy and reposition, unless it's only a reasonably small adjustment. I.e. less than 10kt to reach Vfe next or such like.
MY opinion is that speed brake is next to useless, under 220/230 kt.