I think the results of this test would be that both look similar on a 16x9 TV, but the 4:3 version will look better on a 4:3 TV. Actually I would say that the zoomed 4:3 would be better than anamorphic on 16x9 because TV sets can resize the image better than a PC. But of course this is the argument that still goes on...
I see many posts on these boards from people who argue that anamorphic is the better choice, because they know that commercial anamorphic DVDs have a higher resolution. Therefore they automatically think anamorphic is better. But they don't realise that those are created from the original film, and these DVDs will not be. It is impossible to take advantage of the extra resolution when you don't have the source film. So either way you are just increasing the size of the picture to fill the frame. The debate then really comes down to whether a PC or a TV set is better at resizing the image.
Anyway, if you make both versions, I will be getting the 4:3 one even though I have a 16x9 TV.