I'm speaking as an educational user of all three systems over the last three years.
I'd go Sakai over Moodle any day if they want quizzes and gradable stuff. My experience with the Moodle variant and that tool - which I stupidly tried after everyone else said not to but "IT" told me they had done some great upgrades and it will work really really well - is nothing but negative. My use of the Sakai platform for that, however, was several years ago on an earlier variant, and it worked really well. They even have (or at at UMich at least) a feature that would randomize question order and time your access to the exam.
Blackboard's a slicker interface, I think, and it allows you to make a lot more radical changes to the structure of the site and the organization of the material, but unless you're doing something really unusual with it, I don't think the cost is worth the upgrade. If you're not entirely familiar with it, or don't take a solid training, the number of options is just overwhelming.
no subject
I'd go Sakai over Moodle any day if they want quizzes and gradable stuff. My experience with the Moodle variant and that tool - which I stupidly tried after everyone else said not to but "IT" told me they had done some great upgrades and it will work really really well - is nothing but negative. My use of the Sakai platform for that, however, was several years ago on an earlier variant, and it worked really well. They even have (or at at UMich at least) a feature that would randomize question order and time your access to the exam.
Blackboard's a slicker interface, I think, and it allows you to make a lot more radical changes to the structure of the site and the organization of the material, but unless you're doing something really unusual with it, I don't think the cost is worth the upgrade. If you're not entirely familiar with it, or don't take a solid training, the number of options is just overwhelming.