Both Suspension Trainers are functionally identical. The difference beyond the color schemes (tactical khaki/black, pro yellow/black) lies in what both TRX packages come with. The TRX Force Training kit comes with the Door Anchor, Military Fitness Guide, Force Training DVD for $199.95 while the TRX Professional comes with the All Body Xpress DVD for $149.95.
Since you already have the Military Fitness Guide Program, I would recommend the TRX Home Training Bundle for your wife,so that you she gets the different elements of the TRX Pro package as well as the Door Anchor and Core DVD and Guide. The Door Anchor will give her the option of training outdoors as well at home.