Round or square head battery cable?

Hello Steve Thanks for the offer! But I would keep that pos cable for your
dads car or yours(those are pricey).
I am confused as in the negitive cable. I want to order soon and do not know
the answer to this, They Cassic industries or Year one have 2 options (round or
square )? Maybe I will order the square head and hope for the best, its only a
cable, but why is there 2 styles?
Darryl