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