I'm torn between the two choices.
Model kits are one of the few items where you don't always see the actual product on the box before you open it. You buy a coffee maker- there's a picture of the actual coffee maker on the box. You buy a model kit... maybe it's a picture of the actual model on the box. Or maybe it's a photo of the actual car. Maybe it's a drawing. I kind of like to see what I'm getting, but on the other hand, some of the old and reissue box art is pretty cool.
I do like Round 2's practice of putting a silhouette image of the parts trees on the bottom of the box- that's certainly better than nothing. I think I have to say my favorite practice is how Moebius has been doing it- a nice, eye-catching painting of the model on the box lid and ends, with photos of the actual model on the sides.