I have mixed feelings on the whitewalls. Well, not really mixed since I actually like them both. For me, a lot has to do with the color of the car and the wheels.
One-piece hubs: Generally, I think the darker cars (reds, greens, darker blues, browns) look better with the stripe. I also like them on white cars with white one-piece wheelcovers. Other light cars -- no stripe.
Two-piece covers or bundts: I'd say I prefer blackwalls on whites, light silvers, lighter greys, and light blues for sure -- and maybe even on darker cars.
James
63 230SL