Kawi ninja zx6r or Suzuki gsxr 600?

[vinny]

-Which bike do you recommend for an inexperienced rider, a moderate rider, and an experienced rider?
-I know have of you will say an inexperienced should be on a 250
-how are those two bikes different?
-gas mileage?
-speed?
-corners?
-what upgrades would you add
-how comfortable are they
-good for riding 2up?
-ect.

Thanks