That may be the case of a purely $$$ based assessment, however on noise reduction, and surface quality a true helical / spiral head (not a psuedo spiral) are streets ahead over a conventional 2 or 3 knife cutter head.
The psuedo spirals imo are nothing more than a marketing ploy to capture a market share. They may be cheaper to manufacture than a true helical / spiral head but simply do not live up to expectations.
It gets back to $$$ vs your hearing and neigbourhood peace!