Weights for speed

I’ve done 5x5 a number of times, and I have better results starting with a lighter weight that I can complete all the reps, and then slowly build up. That is opposed to taking a heavy weight and lifting something like 5, 5, 4, 4, 3 and trying to get more reps the next time. It depends on the athlete, but I have a tendency to over-exert myself using the latter.