Please tell us why in either case. In my case, I've detailed my own pros and cons.
Baldur's Gate portraits: Limitless customization. Ability to truly make your character look how you want them to. Inability to change the portrait when wearing different headgear or armor, or showing injuries. (Could use layered images to fix this however)
Neverwinter Nights 2: Ability to change portrait due to injuries, different armor, etc. Easier to make animated portrait (head looks around, makes faces, portray emotions, etc). Will never be as detailed as artist's rendition. Limited by polygon count can make faces look blocky. Takes longer for devs to implement.
Edited by Hormalakh, 19 October 2012 - 10:08 AM.