Divine Insight vs Twist of fate, which bosses should I change?

[Balyn]

Yo guys!

I just came back from a 3-4 months break and decided to roll my shadow priest to my main due my guild needed one.
I haven't really had the time yet to read everything about shadow so I'm just gonna ask here quickly.

In MSV, at what bosses should I go with Twist of fate/Divine insight and why?
You could probably use this as a template:

The Stone Guard:
Why?
Feng the Accursed:
Why?
Gara'jal the Spiritbinder:
Why?
The Spirit Kings:
Why?
Elegon:
Why?
Will of the Emperor:
Why?

If you don't mind I'd like the answer for both normal and heroics.
I'm also off for today so I thank you in advance and good night my fellow pirates!

[Deleted]

Stone Guard: DI, SW:P ticking on more than 1 target, more procs
Feng: DI, last 20% of the fight doesn't last very long, I get more deeps with DI (ToF might be better for hc due to there being adds)
Spiritbinder: ToF, High uptime due to adds dying in spirit phase/proccing ToF on totems when you don't go in
Spirit kings: ToF, Moderate uptime due to having bosses/adds sub 20% a lot during the fight, not a huge increase over DI
Elegon: ToF, Lot's of adds, very high uptime
Will: ToF, lot's of adds, very high uptime.

The genereal rule of thumb is if there are periods where there's alot below 20% hp then go ToF to keep the highest uptime of it, if there's more then 1 target but they aren't below 20% very often(Stone guard fro instance) Then DI is better, DI will generally be better on a pure single target fight where the last 20% isn't that important/a burn.

also, see here: http://howtopriest.com/viewtopic.php?f=19&t=2173

[Balyn]

thanks mate

[veiledy0]

Be aware that ToF procs of healing as well, meaning you can proc it by sniping a PoM/Renew on someone during a heavy AoE phase, such as Earthquake on Feng.

But on the other hand, no matter what you do on Feng, you'll finish last