I’ve already got AE Phase I, and I’m not goin’ for Cobra or Lorr (got 11 tokens and I can still get at least few more)

So the list is:

Kunze, Char, Obj 777 and K-91-PT

I am pretty decent player (1800+ WN8) and I’d like to get some MT but I played HTs and TDs most of the time. Is it worth for me to get Kunze or Char? Or better pick between 777 and K-91?