I will never understand the argument that Borden was worse than Angier. I'm not saying that Borden is a paragon of virtue. He does some rotten things, but it is nowhere near as bad as what Angier does.
Let's compare their crimes:
Borden
-Works with Julia (with her full approval) to come up with a better knot so that she doesn't slip out while being hoisted into the water tank and potentially injure herself. Both of them ignore Cutter's warnings about it being unsafe and it results in her death.
-Marries Sarah and has a family while hiding that he has a twin brother and they often switch roles. This eventually ends up in her suicide. Both brothers eventually figure out something is wrong and try talking to her, but it is too late.
-Sabatoges Angier's bird trick resulting in one dead bird and a few broken fingers.
-Convinces Root to betray Angier.
-Lies to Angier about his method to get him to go America, out of his hair.
-One Borden continues to go Angier's show to figure out his trick after his brother tells him to give it up.
-Murders Angier at the very end of the film.
Angier
-Tries to murder Borden in public. Borden loses his fingers and only keeps his life because Fallon interfered.
-Sends his mistress to sleep with Borden and steal his secrets. She leaves Angier over this.
-Kidnaps Fallon and buries him alive.
-Spends countless dollars funding Tesla for the sole purpose of revenge.
-Shoots his clone (or original self).
-Drowns another 100 (!) of his clones.
-Frames Borden (who was trying to save his life) for murder
-Steals Jess from Fallon.
-After Borden gives in and gives him the secrets to all of his tricks to try and save his daughter, and begs him for forgiveness and mercy, Angier lets him hang anyways for a crime he didn't commit.
Borden was reckless. Angier was psychotic.
I think there was no question Angier was worse.
Maximus One said:
Really, everybody in this movie is quite unhinged I think except for Olivia and Cutter.
And both of them leave Angier for Borden. That should tell us something.