is good to combine ground slam with earthshatter?

trying a melee twohanded playstyle, currently doing decent in t16s.

i use both ground slam and earthshatter because it s nice having the prepared damage for when im kiting or before some spawns like ritual and strongboxes. But im asking if it s worth using them both for dealing damage. Feels like im wasting sockets for supports since half their supports are the same, faster attacks, brutality, ruthless, melee physical damage.
i tried comparing them separately and it feels like the same but them together have that on the move advantage. Tried sunder instead of ground slam but that one doenst have a vaal and gound slam vaal is nice, also hits wider.

since i dont complicate with pob and ingame theres no dps target dummy, im asking if it s fine to continue like this or just go with one of them or go with sunder.