I went with other as well.
I think that the whole thing is based upon the theme of the show. Some cars may fall into multiple categories.

Condition is always going to be a deciding factor, but as for the type of vehicle that will change. Someones modified import can be a show winner if that is what the show is about, but probably won`t stand a chance in a classic show.

Like with an LSP beauty is in the eye of the beholder.
So it will be the same in what people determine to be a show car. Even a fully restored Yugo could be a show winner.
Just can`t think of anyone who would ever bother to fully rstore a Yugo.