A quick query

When doing a black and white design in silk (tent stitch) is it tidier/cleaner to do the black then the white, or the white then the black, or doesn't it matter?* **

*WCOB Pelican cloak badge for those who care.

** After much walking in search***, I have half the silk I need. Shop (Nancy's, 20 min walk away at brisk pace) was out of of black (mutter mutter mutter, on order now, may be at least a week) but had the white.

*** At least a nice warm sunny autumn day for walking but I wouldn't guarantee that next time...