OmniFocus offers Free Trial, but Merlin Project does not.
Merlin Project is designed for Individuals, Freelancers, Medium Business and Small Business.
OmniFocus is designed for Large Enterprises, Medium Business and Small Business.
Pricing for Merlin Project Starts at $5.83/User/Month when Billed Yearly whereas for OmniFocus Starts at $9.99/Month.
Some top alternatives to Merlin Project includes Quickbase , Smartsheet, ClickUp, Microsoft PPM, Wrike, Teamwork, ProjectManager.com, ProProfs Project, Microsoft Project, OpenProject, ProWorkflow, Projectworks, Quick Base, OmniFocus and Project Insight.
Some top alternatives to OmniFocus includes Todoist, Wrike, Smartsheet, Asana, ProWorkflow, nTask, Taskworld, TickTick, Today, MeisterTask, ClickUp and StickyList.