You are going to race with your car? If so, go for the suspension that offers more resource for tuning.
If not, go for the cheapest or better recomended for street use.
You are going to buy technology, thatīs why some brands cost more than others... and in this case the price difference is very significative.
The difference betwen them is hard to tell, you have to find some one who have really tested them all to answer your question.