I voted for the 880, simply because its what I own.
Havent owned the eclipse (you wont find many people that will give you an unbiased opinion on either product, as few have had both). I was considering the 8445 before I bought the 880. I like the looks of the Pioneer quite a bit more, and either/or has quite a few features, so the aesthetics won out.
Honestly, you would probably be very satisfied with either one.