IMO when it comes to choosing a pet, even a pet fish, you need to go with your gut and choose one with which you think you may have a bond.
If you are getting the fish at Petco you might find a color you have never seen before or you might find a fish with a personality so big you just have to get him no matter what color he is.
That said I totally went by colors when choosing my females but for the males I used my gut. And yet I am after a certain color of "giant" because there is only one color available at Petco. and I did want a mustard gas from Mo even tho it will be bought sight unseen...........
I guess what I am trying to say is I'm a hypocrite