Freestyle technique

Hip driven or shoulder driven? The reason I ask is that I'm a shoulder driven sprinter but have a more hip driven stroke in the 200. I've been trying to find some speed from a hip driven stroke but so far have just not been able to come close (24.3 scy hip driven vs 23.1 shoulder driven). Is one inherently better than the other? If so, why? Can one utilize both techniques depending on the race? Is it possible to have an effective shoulder driven sprint stroke and an effective hip driven distance stroke?
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