When I started to do piecing, I tried to match the color - exactly.
Then when I was piecing a scrap strip quilt, I started to use up all the thread on the partially filled bobbins. With multi-prints, it doesn't seem to matter much what color thread I used.
My usual suggestions - practice on scraps and then pull on the seams to see what - if any - thread is showing.
If I'm sewing a white to a dark, it seems to work out better to use a darker color instead of white. The white would show up on the dark, but the dark didn't seem to show up on the white - or at least it didn't seem as obvious.