I don't particularly believe Wyll's character and I can't stand Astarion's sadistic teen vampire antics so I'm stuck with the remaining three companions every time.
I'm not a fan of this design where you only have a few companions to choose from because they have tons of content. I would like the content cut in half, and the number of companions doubled. Adding Minsc and Jaheira isn't going to change much. I never took Minsc in my BG1 or BG2 parties.
I like having the classic Fighter / Cleric / Rogue / Mage D&D party. There should be at least two options that are different enough for each class group, and then an extra 4 bonus characters.
This is /slanderous/. Astarion isn't an angsty teen vampire. He's a chaotic little toddler doing his best.
For real, though. Wyll's invinsible imp is very good for scouting (without engaging in metagaming...).