The player Evil options are definitely of the very "Man what? Why would I ever do that entirely counterproductive and insane thing?! type. There's a lot of randomly attacking people, encouraging pointless murders and so on.
Regill is clearly not from that school, but more the opportunistic, self-denying/closeted kind of Evil (which isn't available to the PC). He reminds me a bit of the guy from the Villain's Handbook, dude with the dogs.
PF:WotR is a tremendous illustration of why "mechanical" alignment is a bad idea though. The best example is trying to play LG. Many of the Lawful choices early in the game, for some reason border on or indeed are Lawful Evil (even if the game just says they're "Lawful"). Some are outright sadistic stuff that Judge Dredd would blanche at and labelled as Lawful. But if you don't pick a bunch of those, and just pick stuff labelled Good, your alignment will drift from LG to NG, potentially before the end of the first act.
Whilst the dialogue options in WotR (unlike KM) are all labelled just Good, Evil, Lawful, Chaotic, they're actually NG, NE, LN and CN (mechanically), and it's just hiding that. And the writing makes Evil and Lawful very frequently look like Chaotic Evil and Lawful Evil respectively (for the player). They say they were trying to improve things by doing it this way but I think it makes it worse.