Thoughts on iThoughts (2go)
it seemed pretty good, pretty ok. The limitation comes in when you can't export a map that has more than 20 items in it. So I can't try that. There's no free trial.
MindNode has a free two week trial...
Update:
Went and purchased the full version.
There's also the option of doodling in the app which is convenient especially when I want to jot down a quick note with an apple Pencil.