should i get level 145% cold mastery so i reach 150% with cta's "Battle Command"?

or should i get max level cold mastery ?

depends on level and gear but either will work fine. One will be slightly better.

As high as possible

Max cm
Now It only Works with 1/5 efficience on sundered Monsters

thanks guys.

just makin test runs and ill try to see which is better, i prolly get as high as possible.