I'm in the priveleged position of having a lot of gear to pick and choose from; but I'm not really sure what is best and would like some opinions.

The two set is, lets start, decent. It is a noticeable rage saver. However, it is by no means going to change the way you play or do anything drastic. The 4 set is completely out of the picture so; even though I could use it, and have the pieces for it, lets not consider it.

These are the pieces I have in the slots in contention and am wondering whether the rage saving and mastery, is worth the extra multistrike, agility and stamina as well as secondary stats from not taking my 2 piece.

Mythic Flamebender Shoulders
+
Mythic Gruul Chest
+
Heroic Warforged Blackhand Legs

And I replace my legs and chest with heroic tier pieces, whilst keeping shoulders.

My character is currently on Thunderhorn and called Lyuben. Look him up for better context of the items; as I can't seem to link items or armory.