The best - but at what cost?

I had the opportunity to test four different brush heads now. With a Färbetablette I have each made the results visible. CrossAction is definitely the best brush. But at what price? Production costs are unlikely to be but so much higher as that of TriZone (currently, for example, per capita about 3.50 instead of 5.00 here.) - It looks even cheaper, because the head is not divided into two parts.
For the action, there are 5 star, for the inflated price between one and two star deduction.