whats the best secondary skill for brutes ?

I was wondering whats the best secondary skill for brutes would be for a defense power ?

Brutes who are going to do what?

Goals determine the criteria for judgment.
The criteria determine which secondary to pick.

While your question is a bit unclear, the Super Reflexes set offers the most defense, and the Elude power from that set is likely the strongest defense-enhancing power, alongside Overload from Energy Aura.

As for the best single defense power, though... that'd probably be Invincibility from Invulnerability or somesuch.

Finally, for Power Pools, Weave from Fighting is by far the strongest defense-enhancer.

Many will tell you that cross-stitch is the most potent secondary skill for brutes. It's true, everyone will find themselves needing some embroidery sooner or later and it's a proven way to earn a lot of gold pieces at the market. If you ask me, though, the smart money is on macramé. The brute's thuggish demeanor belies the nimbleness of his fingers. If you want to earn some serious coin, we're talking platinum pieces here, it's macramé skill or bust. I believe it was former lead designer Sexy "Jay" Jacobsen who coined the popular phrase, "You can-knot go wrong with the macramé skill!"

Short answer: there isnt one

expanded answer: im too lazy for this.