For me its definitely 2005 version, all the way. The main reason is the lighting! The BBC version had cool and sedate lighting and the 2005's stunning and glorious colors were just intoxicating. The rising light of dawn at the end? The sunsets? The colors at the ball? The colors when they were at Darcy's house? I just. I need to rewatch again, frankly.

I also just love the actors better as well. *shrugs*