Since I've been trained in car styling at Art Center, I guess that helps my qualifications in addressing this question. Altho, your personal leanings should be the final determining factor. It's your $$.
On the Balocco, I find the stick-on graphics along the belt line a bit heavy handed. The paint detailing on the rims make those a bit more special, tho. As the Campy rims ran from '81-'84, those are the most common of the 3 (or 4) factory offerings. it does set them apart. If your eventual intent is to resell a GTV6, the Balocco is usually seen as the most desirable, due to it's limited production numbers. Same with a Maratona.
The 'wine glass' rims on an '86 may be seen as a bit more attractive (by some) than the Campagnolos. And unique, due to one year offering. Those are a little lighter, but more prone to warping with a curb scuff, or serious pot hole encounter.
I believe the Baloccos all came with red paint (jah?). No deductions there. But, on an '86 there were several paint choices. This detail might sway your styling preference, for this reason: the window graphics on any GTV6 are quite important to how the overall shape is perceived. If you have a car body where the window cut outs are bland or ugly, you will want to disguise that detail. The best way to do that is to chose a black or charcoal paint job. On any car, the window glass is always read as a medium-to-dark grey. Nearly the same color as the metallic charcoal paint offered on GTV6s. This creates the overall appearance that the entire car has been painted grey... body metal AND glass! Thus, you read the entire body as one singular lump. This makes the car look heavier. Also, a metallic charcoal is similar in color to raw steel, making it look heavier yet.
The GTV6 body has gorgeous window graphics, which are crucial to display, if you want to see what Giugiaro had in mind. A color, which is highly contrasting to the grey window glass, will bring this to light. Like: a white, silver, or red. Now, when you look at the body, you subliminally see the glass as a separate element from the body metal. It then appears that the windows were removed from the body... making the shape look much lighter in weight. And illuminates that beautiful kick-up at the rear of the side glass.
Some still prefer a darker body color, like charcoal, black, dark blue, or dark green... to get the extra reflective qualities that a white or silver cannot. There are a couple of 'designer tricks' that can help bring back the window shapes. But, those would not be truly stock details. Check out some side views of GTV6s, in different colors, and you will see what I mean.
Hope that was a little help, when you make your decision.
Cheers,
Peter