If contracting a vendor for multiple locations, particularly over a wide geographic area, the most important factor would be

Criteria in contracting a vendor are:

Years in business Ability to constantly supply products. Ability to supply complete requirements. Flexibility to allow changes in orders or product lines. Substantial catalogue of products. Has staff that can answer questions you may have. Testimonials and references. Sustainability and financial stability. Prices. Delivery times. Terms of business. Customer service.

The most important factor to consider in contracting a vendor for multiple locations would be delivery times. You need assurance that deliveries can be made where and when you want them.