So, would it be Things, Omnifocus, FireTask, or any other one out there? I do actually have all three of these, and most definitely would recommend FireTask. Just finished migrating everything over to it today.
Did you previously use OmniFocus? That's what I am using now. I especially like the iPad version and wish the Mac version were more like it. Because I already have Mac and iPad versions of OF, is there any advantage to me in switching?
I tested and used my combination enough to know that I'm safe, but you bring up an excellent point. Same apps would be much easier to troubleshoot if something goes wrong.