I have to confess something
I like omnifocus because of it's database and professionalisme. My main difficulties about Omnifocus is that I never forget my system.. My spirit is never in peace.I alway feel it uncomfortable. when it come to act I am reluctant and often I procrastinate... The way projects are set is not as good as Nirvana. I know it is fully operational and well organized. I spent so many time for setting it that it is close to what I think is the best for me... I also spent a lot of time for tricking the system... On another hand I am confident with OF. I know that it works well, I know that it is able to deal with anything, lot of coach use Omnifocus, I can fix anything and at last developpers works on the system... They will soon release OF4...
About things I find it beautifull, but it is less easy for me than Nirvana. For acting It is also more complicated to use (no selection tools only tags). About my spirit it is not in peace. The way projects are set is not as good as Nirvana. From my opinion the design is great, It is nice and pleasant and great for planning. But less for GTD... Lot of people like it, but the software is not as good as nirvana is. Developpers are also working on Things regularly; but it is less easy to know what will be and how it will evoluate.
It doesn't do that to me with Nirvana. There is nothing to trick. I stay focus. My spirit is in peace. When comes acting I feel more comfortable with Nirvana I like the way project are organized, I can plan easely, I can select stuff by areas, by time, energy, I can also star every things witch matter today. I feel quiet with Nirvana. The only thing witch bother me is that I have no real safe of the database I can export and import in case the computer server crashes... And I don't know how much time it will last... Imagin if the software end what do I do ? Impossible to know what are developpers plan... Do they develop or not ? I am worry because It's a professional use...
So at last, for the moment, I stick with Omnifocus and try to make it work the best, I can...
Anyway If I would try to make a rational choice I would wonder how many people use Nirvana ? How many for Omnifocus ? How many with things ? What is the best according security, safe, organizing, easy doing and planning, easy organization ? Can't find any answer about this...