Used kanthal forever, just started playing with temp control so I have some SS and NI200.
My vote goes to kanthal. The NI 200 is ok, but its pretty soft and since the resistance is so low it is only good for temp control. Which I am not overly impressed with yet.
Stainless is just to stiff and springy for my liking, but I got 26 gauge. Maybe something thinner would be easier to work with. Would let me build some higher ohm coils for non temp control as well.
28 gauge kanthal is still the go to wire for me right now.