The Ancient has higher Base Damage (1533 vs. 1962). AS is useless, as mentioned. So reroll AS in %dmg, when you have a gift for adding a socket. Its a pretty obvious choice.
edit: you have about 300 Str more on the Ancient one. Additionally you get other multiplicators from different slots. When everything adds up the difference of the %earthquake dmg is marginal while the higher Base Damage kicks in.