I feel like people are trying to be too specific. It's an impossible question to answer with specifics.
In general burst ST target damage will be Stalker > Scrapper > Brute > Tank.
For AoE it's generally going to be Scrapper > Brute > Stalker/Tank(not sure on this one. Tanks do less damage but generally have more AoE, so my assumption is Stalker does more).
There are exceptions to this as TW/Bio Scrappers will outdo anything a Stalker can do. And Elec/SD Stalkers are better than Scrappers because of the way the two nukes don't crit and don't break Stalker Hide. Spines/Fire is better on a Brute because their taunt mechanics override the fear in Burn.
The damage obviously goes to zero if you face plant, so that's a consideration. If it stays alive a Stalker will generally take out an AV the quickest, but Stalkers have the least HP out of the four, so they also face plant the quickest.
Also, if the Tank changes on test go live as is, they are going to be moving up that AoE list.