I would definitely go with the white background. It makes the words "pop" more.
Good luck!
Since I've gotten such a great response, I figured that I'd share some more info. with you all. I created the theme for my website myself. I then had Lori of pretty-prints.com custom design matching business cards. Her prices are very comparable to something that you'd get at Staples or Office Depot but so much more stylish. She has a lot of great designs on her site but she doesn't charge any extra to create something totally unique.
I will echo the call of the white!
Although the pink may grab your attention from far away. So then you have to consider, do you want people racing up to your car to see what you have on your window or have it be more pleasant to look at to people directly behind you in traffic. *hee hee*
All in all, I'd go with the white.
I'd also be interested in knowing how well this works as an advertising tool. Please keep us informed on how it works for you.
CherryBomb your website is really cute! I hope it all works out. Let us know!!! I will be asking you for the same help soon.
I agree with everyone else, the white is a lot more pleasing to the eye, and if you imagine yourself driving at speed past your car, the white one will be easier to read and catch the business name without taking too much time off the road with your eyes. We have a saying "Be Safe, Be Seen" meaning wear bright colours - but in your case this does not apply!!!
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