Guild Wars 2

I have a slight dilemma, in which I have 2 sets of armor, but they both provide a boost to either stat.

In one set I use Hoelbrak, which provides mainly power, with some might variables and a reduction in condi duration.

The other set uses Melandru, providing mainly toughness, and providing a 5% higher reduction of conditions and stun durations, while providing nothing for offensive.

Using a set of knights with melandru, compared to a zerker set with Hoelbrak, I can create a disparity of only 208 power, but a whopping 480 armor and 16% critical damage between them.

I am torn between the 2, and am trying to determine which would be the more advantageous stat to focus on (if toughness/armor in fact has a diminishing point)

For visual comparison:
http://i.imgur.com/Ya1Cbzt.png