Hmmm...good to know. As I find anything out I'll post it. Kelly (aka Puffer Queen) is a wealth of knowledge on captive puffer behavior. With her input, among others, hopefully we can get closer to answer on this topic.
Somtimes I wish research would go into areas there wasn't stupendous funding, but without it, the knowledge is up to us. That means that WE, the passionate pet owner, has ultimate responsibility. Treat the charge accordingly. Thus, the best knowledge of the species and the future lies in the hands of sub $11 an hour fish store employees. This is both a comfort and a travesty as only those with passion towards the industry remain...unfortunately we have lost too many to other higher paying pursuits. Its why LFS's can be both the greatest asset to the continuation of the species and its worst nightmare at the same time.
I've owned separate specimens (similar to xtrmchopz) and they all have similar personalities although it could be argued that anyone physically in the same space would believe the guinea fowl puffers to act more "feminine" and the golden more "masculine" based on subjective observations and our own cultural norms there is still no conclusive evidence to nail down the gender either way.
As I said, this subject is of great interest to me and I am very curious if anyone has any information to confirm things one way or the other.
Hope this helps...