Since you describe yourself as technophobe, I would say Things is the better option for you. It's easier to learn and you'll get a better feel for how to get organized using to do lists. My roommate wrote a introduction to using to do lists including things that will help you get started.
However, I do think Omnifocus is a better app. Things doesn't support over the air syncing (or it doesn't work as well). So while you are updating it on your macbook, you can't use it on your iphone. Omnifocus does this really well.
Also, like mentioned earlier, Omnifocus has a steeper learning curve but will give you more power to using it. I really love this app but it also took me a couple months of experimenting to figure out how I use it optimally. Even for basic usage, it's fine too. If you are willing to learn the app you will get A LOT out of it.
If you really want to use your macbook and iPhone together, go for Omnifocus and learn it. If you just want to use something simple and only on the Macbook, go for Things.