The models you listed are all quality equipment made by industry leading manufacturers. Next thing to examine is which series offers the features which are most important to your particular application. Consider things like the size of the steam generator, the steam line length, the drain technology, and the control and steam head design and finish.
This site provides a nice comparison table of the available features of the generators you mentioned. Follow the link below to size your generator, if you already have done this, simply enter your adjusted cubic feet in the box at the top. Once you get the list of generators that are sized for your application, select the check box next to the models you want to compare and click the compare button.Generator Sizing Tool