I think hold and attack ground works pretty much the same way, i really cannot tell the difference at all what they do, apart from attack ground will follow mobs a little bit more, and hold will not
and the big problem with these skill is this
if your attack / hold pet in a place, then ride, use skill, jump off before skill finishes… pet finishes off skills and then derps
if you ride, use skill, jump off before skill finishes… use attack/hold, pet stops skills immediately
if you ride, use skill, jump off, gets knocked back / runs too far, pet follows you
so right now, i do not see a use for these 2 skills at all