Hard to say, really. But I think I would prefer the v6 because of the overall appearance. Beautiful crown-guards in particular. As for the insert on the zf, I think much of it depends on if you are looking at the dial dead-on straight and the fact that you are aware of the issue. The insert isn't bad at all. I think both of mine are pretty equal when it comes down to quality. As for the weight ( not an issue for me ), the are both way too light v6 about 135 grams, zf 170 grams and the genuine somewere around 190-195 grams. Should point out that the lume is better on the zf. I use my watches basically as timekeepers, but for those that care, - the bezel-action differs some.
Edit: They weigh aprox. 130 grams and 145 grams. Genuine with the Eta weighted aproximately 155 grams.