Some may be taxonomically unique the last representative of an otherwise extinct group of animals, like the duck-billed platypus or the long-beaked echidna while others may differfromeachother only slightly.
Some clear answers as to how the drugs differfromeachother are expected from the study, called the Trials of Intervention Effectiveness (CATIE) and funded by the National Institute of Mental Health.
My answers to those questions may differfrom yours, but dividing up into warring tribes and demonizing eachother aren't the ways to figure out who's right.
For example, the distance between the centers of two black holes in galaxy clusters distant fromeachother and the gap between cell walls in a living organism differ on a vast scale, despite their sharing of common structures at the atomic level.