Personally I think a solid sticker would look better than a vinyl cut-out, depending on where you put it. If I put a cut-out on the glass I would think it would be harder to see with everything behind it than if it was on a black background..
Virtually every other event sticker has been die cut...cuz quite a few of us have tinted out the side windows...
LIMO BLACK FTW...
That's also the reason all of my submissions were presented as negatives, with the background being black.