Is it best to use one or multiple TEM vendors to manage technology expense?

A single vendor supporting all technology expense is ideal for creating a single, consolidated view of expenses and the components that comprise expenses (assets, services, features, configurations, one-time charges, credits, etc.), while eliminating the need to manage multiple vendors. In the event multiple vendors are selected to manage expense, integration between solutions and/or third-party software to establish a consolidated expense management view is advised to maintain the highest degree of expense visibility and control.