As usual, someone makes a better point about a topic than I do. This time it's Ben Brooks on 2Do:
And the best part is that I can recommend it to anyone and everyone. Whereas with OmniFocus I would be hesitant trying to get most people using it, with 2Do I feel like you can give it to anyone. They might not get why you like it so much at first, but it will only be a matter of time before it clicks with them. And they likely won’t experience any overwhelming feelings as most people do when they start with OmniFocus.
I've thought something similar since switching to 2Do. With OmniFocus, I would only rarely recommend it to someone. And when I did, I did it with a lot of caveats. 2Do is nearly as easy to use as Things, while being about 100x more powerful.