Thanks for your question. I feel the best way to achieve what you are looking for is to perform the evaluations yourself and then work with the appropriate individuals from each company. What may be important or useful to one might not be to another. I also think using the Qlik forums, you might get a biased opinion. If you search the forums you probably will find that someone has already answered this in some fashion. What is really important to understand, are what are your or your company's needs?
Do you just need a data visualization tool, like Excel on steroids for example?
Oor are you looking for a complete data visualization, self-service platform that addresses multiple use cases such as the ones demonstrated here: