This is going to be the general trend most of the time now when comparing one item to another. Trinkets will continue to be an exception to the rule because the effects vary greatly from item to item. But when comparing secondary stats (Haste, Crit, Mastery, Hit, Expertise, Spirit, Dodge, Parry) to primary stats (Intellect, Strength, Agility) the value of the primary stat will often be significantly higher point for point than the highest value secondary stat. And with the addition of reforging, the least valuable secondary stat can always be converted into something more valuable.
When it really comes down to it though you will have to actually run the numbers through a tool like a DPS spreadsheet or application like Rawr.
"In anything, if you want to go from just a beginner to a pro, you need a montage." /w TankSpot WTB Montage for Raiders.