51:1 vs 100:1 geared Nema 17


Hi all, I am working on purchasing all the materials I need to add GoTo to my Zhumell Z8, and have seen others' dobsonian mounts using either the 51:1 with a 20 tooth or the 100:1 stepper motor with a 40 tooth, both giving the same gear ratio of 800:1 since it's connected to a pulley. 
Is there any benefit to going one way vs the other? 

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