I'm not sure yet which one is better and wil wait for a sim but it's a fun talent imo.
Don't forget that you are doing Flanking Strike instead of Throwing Axes if you have the talent and Flanking Strike can crit for over 400k just like Throwing Axes, so I'm not sure which one is better (and with the talent helps resetting Eagle and giving faster Mongoose charges).
I like playing with Animal Instincts more than Throwing Axes, but everyone has their own play style
(I was thinking to stack haste and crit so you can do more Flanking Strikes (pet can do more attacks as well because of the extra haste and focus regeneration), have lower cooldowns and get more Mongoose Bites (esp since haste also helps pets now because the mastery got fixed) of because of the lowered GCD with haste, but if haste works negative on this talent that idea isn't going to work :'()