All the trinkets this tier are really good for us, Its just a matter of whats the *best.* The Simulations, done by the fantastic Slippykins, have shown that the damage difference between the trinkets was very minor compared to the total damage we are doing. Pick the trinket you are the most comfortable with. Atleast, this is my advice *shrug.*
Edit, See this Graph (Shamelessly stolen from the front page of this thread) http://i.imgur.com/Wx3szRP.png Where Slippy shows the difference between all the trinket combinations. Che-Ya+Wush is only ~1k dps higher than Che+Breath. In the end, its just personal preference.