I've recently thought of which trinket should I be choosing between these 2 http://www.wowhead.com/item=93259(1 min CD)
or http://www.wowhead.com/item=86792(45 ICD)
I can see the difference between these two is ~1000 INT and ~200 haste. The thing regarding the one which requires to be used is that i can control better when to activate it for example during execution phases like when I use DS/BL/Hero or anything like this.
Use Light of the Cosmos, as affliction you should theoretically have a 44% up time on its proc (45 second ICD, 20 second duration, 25 seconds of downtime)
for affliction LoTC definatley. probably shock charger medallion for demo though - i think that demo values on-use trinkets very highly and demo doesnt have enough dot's to proc LoTC reliably.