Black! I!! I

I think you have your answer. Black for sure.

Black makes it stand out!

Black for me, too.

I like the black also, but wonder how it will handle being laundered. Will it be washed often, etc?

Black zings! (Unless the quilt is a gift for someone who HATES black.)

Black for sure!

No offense intended . . . it's almost a "no-brainer" . . . Looks sooooo much more vivid on the black . . . that's what it needs to "pop" the colors!

Personally, I like the black background better, as it really makes your quilt blocks pop and look brighter.

Black, without a doubt. White does nothing for those colors.