Originally Posted by
Shottgunn
Your personal stat values can change back and forth depending on what gear you have (haste proc trinket or not, gear levels, etc etc etc). There is no rule of thumb other than sim it yourself to find out your own values. Mine currently favors a mastery build if I'm using the haste trinket, and sims higher as a haste build with cunning of the cruel.
Rathrak also does not approach DTR even in aoe heavy fights. Remember that while rathraks minimal damage output is hitting more targets, DTR is also proc'ing off of chain lightning and earthquake which will provide amazing amounts of dps. DTR is your bis by a long shot in all situations.