hello just asking which servo is best for my z axis which weight around 50kg

i got 3 choice the price is same since it used

1KW Delta ECMA-EA1310SS 17 Bit Absolute <medium inertia
1Kw Delta ECMA-E11310SS 20 Bit Incremental <medium inertia
750W Delta ECMA-C1 20 bit Incremental