I’ll start off and say, I love OF! It is so easy to use and works so well for personal project management.
It would also work well in a business setting, but unfortunately, there is no option for multiple licenses or to share projects among teams. I’m sure this isn’t just a quick fix, but you would have 1 business as a customer if you added a group collaboration feature. We already pay monthly for SmartSheet, and although it is 99% customizable, I’ve found that it lacks in simplicity and creates more workload updating and managing our sheets.
I have tried out OmniPlan and do not find the features beneficial for my organization. I like the layout, design, and flow of OmniFocus and hope you will update this as we would love to switch away to this, but are currently testing out other Project Management Online tools.