Well, my situation will be interesting, although GG's are not involved (standard HBG, purchased from MO hatcher).
My first pond has HBG, standard BG, CC and LMB along with RES in it. It is just starting to produce some nice gills. Second pond (not filled yet) will have same mix, with the exception of the HBG. I'm planning on leaving them out, as I've a source for some really DANDY BG's, and am able to catch them readily.
Maybe I shouldn't have mixed the two, but they're both in there. Time will tell. I'm not the most patient person, but over the years, I'll be able to see the difference, if one exists.
In a lifetime, the average driver will honk 15,250 times. My wife figures I'm due to die any day now...