Brian;
As far as which is appropriate either could be used.
However, where is the "courtyard" to be located?
Is it the courtyard of a mansion house?
Is it a courtyard between some rowhouses?
Is it a courtyard in a town square?
The "location" would determine the nature of the courtyard and the pattern of cobblestones or brickwork to be used.
By this I mean if it were the mansion house, obviously the owner has money and would want a more elaboriate pattern of stonework such as the fan type to be used.
If it were a town square the same could be inferred as well.
However if it is a courtyard in the rowhouse area it may be just ordinary stonework with little or no pattern.
Do you see what I mean?
Take a look around where you live and look for the differences in architecture and its usage. You will note differences in areas and architecture styles used, even within a block of one another.
I hope this will assist you in making a decision and hopefully a unique diorama.
Cheers;
Gregory