Personally I absolutely hate the taste of fondant sheets & so does everyone else I know.
Personal tastes aside I do use fondant sheets on request, I would only recommend them if you are already doing a fondant cake & only for big images. But I would actually use Wafer Card for the large images (or wafer paper works well too)
For me it is wafer paper all the way & Vanilla over unflavoured all the time, I even use vanilla on savoury items (but then I am a little obsessed with vanilla )
We are able to get images nice and clear on wafer paper. For larger wafer designs when I want them to stand up I will use wafer card. These work best on the side of large cakes when you want the image to stick up over the top of the cake slightly.