You can't expect me to choose which of my sweeties is my favourite child! (But it's Lae'zel

)
I also like Wulbren. Writing and characterising an unsympathetic character that is still very believable like Wulbren takes a lot of skill and I respect and appreciate how they pulled that off. His involvment is also nicely tied into the story.
Wulbren is lowkey the best written and most realistic villain. Yes, Raphael is flashy and Ethel funny, and the three Stooges have their simps, but Wulbren is your everyday villain, who starts out wanting teh right thing (stopping Gortash and retaining right of free speech as he explains at one point to you), but he looses his humanity along the way. If you read his diary in the Underdark, you see a glimpse of the person, he once was.
I also think, that Wulbren is the only villain, that is redeemable.