Bowl blanks

Oliver Springs, TN
I'm about to mill a walnut log I've had for a few years into bowl blanks and I'm going to try and sale a few. I think the biggest I'll be able to get is maybe 10 x 10. They will mostly be 6x6 and 8x8 by 3 to 4 in thick. My question is if you were purchasing bowl blanks would you rather have square or ones or ones that are already round? I can cut them into to circles on the bandsaw.