rares stat conversion isnt exactly spot on, but the premise remains the same. you get more raw AP from savagery (which is helped by heart of the wild now) but you get more than "just" AP from agi. namely, you get some armor, more dodge (always nice), more crit, and half the raw AP as savagery. since HotW affects AP instead of str now, 35 agi becomes 35+3.5 AP in addition to the benefits of crit, armor, and higher dodge. savagery is just a flat 77 AP after talents.
only worth it for a pure dps weapon, and then only if the added crit and dodge from the agi isnt needed (and dodge is always nice in raid settings where aoe of various types may be flying about).