A size comparison to my JL viper. As you can see the viper is bigger and more draggy. Huge canopy, taller and thicker airframe. Much bigger vert fin too.
However the K140 is the correct turbine for it and the K100 is weak sauce in it. It still lands like a putty cat. Even with the K140, though I never open it up much past 3/4 on straight lines, its not breaking 150mph by much. However the takeoffs are vertical.
Wings are similar in airfoil and size. The Bandits wings are wider and the vipers wings are longer (excluding winglet).
Not the best compare since I am neglecting the tails.
Don't know why the pics are updside down but whatever.
So going to think the K140 over and maybe consider a K100.