Which LMS is the best for the organization and its constituency in terms of learning effectiveness?

A Representative Educational Technology Challenge
A large educational organization that offers online courses and provides online support for courses and projects is considering changing its learning management system (LMS). Questions to consider include the following:
1. Which LMS is the best for the organization and its constituency in terms of learning effectiveness?
2. Which LMS is the most affordable for the organization to acquire and maintain?
3. What issues exist or are likely to arise with regard to support, acceptance, and use?
4. How and when will existing courses, support materials, and projects be migrated to the new system?
5. Who will train staff (and when and how) with regard to effective and efficient use of the new system?