We require that logos be built using either Adobe Illustrator or CorelDraw. Those are the best programs for creating quality vector files.
In recent years, we have seen many versions of "logo design" software claiming they can make quality vector logos. Those programs come full of stock images (which are not allowed in any logo project) and low-quality fonts. As a result, we do not allow them to be used in logo projects.
Logo designs need to be very flexible and editable for clients to use on stationery, websites, billboards, and swag. On crowdspring, all logo projects require vector EPS files as part of the final deliverable files.
Photoshop is not vector software and should not be used to make logos.