I am going to create a network with one domain, e.g.
example.com then going to manage my websites in folders. Look below for example:
www.example.com/market www.example.com/freebies www.example.com/personalblog www.example.com/shop
Consider that all four websites have different design and codes. From SEO perspective, is it recommended or I should use subdomains or buy four domains for each website?