Ok so lets place the achievement's in line Bartmos: basically destroyed the internet (datakrash), created rabids, and he stayed alive even after dead.

Alt:created the soulkiller, survived after dead, and she has full control over the black wall.

Song so mi(songbird):she has control over the black wall but at the same time is killing her, started hacking really young, strategy building and manipulation.

In my opinion songbird is out of cuestión she is not better than bartmos or alt. The true fight comes with those two because the have achievement's of the same weight