Which one is the best software for optimising process parameters by response surface methodology(Central Composite Design)? Minitab 17 or Design expert 18?
Design Expert package is specialized for two goals. Design of Experiments (DOE) and constructing RSM. If your problem's requirements that you want to be optimized are supported by Design Expert, it is suggested to used this software, because is more user friendly. But, some times you need to define more complicated problem in terms of objectives and constraints with different types of variables. So, you can also consider the MATLAB optimization toolbox.
It is not like that which software is good or bad. we cannot compare like this but regarding to your questions design expert is quite simple to use than other. coming to results for interpretations you can look for JMP once.