Thank you for contacting Slingbox Forum. I certainly understand your confusion! I have not heard of the different models you named in your post but I am in the US.
You may want to look at our contact link and choose the correct language for Switzerland at the change country option and call the Support line for you:
They may be able to assist you in explaining the differences in the models and help you make a decision as to what model is best for you.
Hope this helps with your issue!
Have a great day!
Sling Moderation Team