So, I preordered for both consoles. I got two codes to enter for the beta, and did that. Both of my accounts link to one email address. It looks like because of my lack of foresight to link one of the console accounts to different email addresses, I must choose which console to get a beta code for since Bungie's beta site asks me to login and pick my platform.
I did it first for PS4. I did it again for Xbox one, and my Bungie profile changed the PS4 platform choice to the Xbox One platform, not realize I own both consoles and entered a preorder code for both, and show I'm eligible for one beta code for both consoles. Bah!!
Most of my friends will be playing the Xbox One beta, one of my friends owns both like me, and will likely join out other friends in the Xbox One beta and buy the game for that system, so, I'll have to beta on Xbox One if I'm forced to choose. I HATE that I may lose out on playing on the PS4 a week before Xbox One because of a technicality.
This is more of a warning for those preordering for both systems and linking everything to one email address.
Maybe someone will later be kind and I'll get a spare PS4 code.