cultpass BLACK will give you unlimited access to all gyms in your city.
cultpass GOLD will give you unlimited access to all standard gyms and 4 sessions per month at premium gyms or cult centers in your city.

cultpass BLACK comes with certain added benefits like the ability to pause your membership incase you need to take a break; 5 sessions per month in a different city so that you can stay healthy while travelling; the ability to transfer your membership across cities if you need to relocate. These benefits are not available on cultpass GOLD