Lots of variables to consider. Type of ground, top soil, sandy, clay? Is your ground flat, hilly? What type of disk, offset, or tandem? How much does the disk setup weigh, 500lbs or 5000lbs, more? What size of disk pans, 16", 18", 20", 22", 24" bigger? Pull disk, pull disk with transport wheels, 3pt disk.
All of these things interact with each other. So what works for one person might very well not work for you. See if you can see what people around you use, that will at least give you an idea of what might work for you. In my opinion, you should be able to pull a disk under any and all circumstances that might occur when you are disking at your location.
For years I could not figure out how some of these guys here on TBN were pulling 12' disks with a 5-6k pound 60hp tractor and not having any problems when there are times that the tracks on our Cat D6 slip while pulling our 12' disk. I would think to myself, how in the world can these guys pull that big of a disk with that small of a tractor? Well it all depends on the conditions and equipment that someone has. Just because someone can pull an 8' disk does not prove that they can pull any and all 8' disks. Again, lots of variables to contribute to if it works or not.
Good luck finding what works best for you.
