For the very first talent you can pick between 4 choices.

I was wondering what is the difference between Compounding Aether, Deep Breathing, and Timewalker's Pursuit in terms of damage.

Is it better to specialize into Dragon's Breath or Sand Blast for the corresponding damage boost?

Or should I use Timewalker's Pursuit for a flat 5% ability power?

Obviously there are various pros and cons to each choice with respect to other talents. I am trying to understand how effective the 5% ability power bonus is.