Need a good combo
I always find doing a heavy 3-5 rep max followed by a power lift or plyo excercise brings out the best in me. I think the way alot of coahces break it down is the simple physics law > strength+speed= power. If you work on strength and speed seperately for a period, then for say a 3-4 week period try more power based work it should give good results. But everyone is different and depends on whether or not you are trained at power movements like C&J or snatch.