Accuracy of 45XX vs 56XX

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I am almost about to get a KS with either 4502/4520/4522 or 5625/5626.

I lean towards the 45XX for the smooth 36k bph. But I am wondering how do these movements compare in terms of daily accuracy. Ideally I want sub 10s, as even a modern NH36 can do that.

I am looking at a recently serviced 4502 that's losing 30s a day which seems pretty inaccurate. Would servicing normally imply adjustment for accuracy?