What is the correct permission for folders on linux servers in production? [duplicate]

Reading the PHP manual and some tutorials I was in doubt about what permission to leave in the folders after image uploads. Some tutorials speak to leave as 0755, others like 0750, which one to use in this case for application security and web server?

1st Example:

chmod ("/arquivo/diretorio", 0755);

2nd Example:

chmod ("/arquivo/diretorio", 0750);