When we ordered our Model Y, my wife wanted the black interior while my son and I strongly felt the white seats made the car much brighter and gave it more of a wow factor!
Now that we've had our Y for about 5 months, my wife has said a few times that she's glad we went with the white seats.
They're very easy to keep clean (just keep some baby wipes in the car or your garage) and really give the interior an amazing look!
If there's a Tesla store near you, go in and check both interiors out, but I'd say the white interior is easily worth the extra $$$.