I'd say go with ALEKs.
If you're not sure, both companies offer free trials. You could check those out and see which one works best for you.
EDIT: StraighterLine is moving their courses to Moodle soon instead of Blackboard. They plan to do this around Dec 12, so if you really LOVE SL, in the blackboard format and/or hate moodle, you might want to sign up in the next week.
If you're not sure, both companies offer free trials. You could check those out and see which one works best for you.
EDIT: StraighterLine is moving their courses to Moodle soon instead of Blackboard. They plan to do this around Dec 12, so if you really LOVE SL, in the blackboard format and/or hate moodle, you might want to sign up in the next week.