User blog comment:TheTobarMethod/Do AP's Need A QSS Upgrade?/@comment-5764087-20130904183306/@comment-5263329-20130905183016

Removal of 100% of all debuffs in the game on a 90 second CD is stronger than removal of only ~80% of debuffs in the game + 65% tenacity for 3 seconds on a 210 second CD. You can use it 3 times in the same period of time that you can use 1 cleanse.