Teebo or Chirpa for Heroic AAT...

It depends on your other toons. Chirpa is less RNG dependent but your dmg depends on how many hps your 3 tanks have. You see everyone posting videos of big dmg but the problem is if you are asking this question, your tanks are probably not max geared and perfectly nodded.

Teebo provides more than listed, his biggest asset is stealth which negates counters and his ability to dispel the offense up. The TM boost and removal take a back seat to those imho.

I do over twice the dmg w a Teebo lead due to my weak RG and SF and that I can't fully form an optimal B team yet w TFP.

For Chirpa, you want his lead but also his speed up. The healing is nice as well. After he gets two turns it's not a big deal if he dies but he does provide another buffer before they start wailing on your DPS.

I spent a few weeks playing around w this once I starred Chirpa. I thought once I get Chirpa 1m will be easy peasy but unless you got max everything, max dmg is going to depend on a lot more than "which is better". I went from 800k Teebo to 325k Chirpa so went back to Teebo until I can max gear RG/SF which at this rate will be 2-4 months ugh.