TWW trinket darkmoon deck radiance / ascension

Hi
For my healers (ex: resto shaman, ilvl 571) amr shows darkmoon deck radiance is (1%) better then …ascension
Now the radiance says “damaging spells and abilities …”
I am mostly doing raids, and i am not / very seldom doing dmg (too busy healing) , so i can not understand why radiance is preferred to ascension (ascension is a secondary stat buff) for my healers as they have same intelligence (2024) ?
IWhen this radiance trinket is equipped, no buf is shown in the “buff-line”.
even when i get some trinket as loot having more int, it still says radiance is better.

We can reduce the value of radiance for healers a bit.