ORIGINAL: MinnFlyer
I have flown all 4 of the planes you mentioned and I vote for the Sensei - hands down!
Ibid... of the those listed it is the best one.
I had someone show up with a Flylight and aside from very basic orientation it is a horrible choice for teaching someone else.
The slightest breeze will blow it away or cause it to weathervane, it has no ailerons, it is underpowered... but it IS cheap.