I think the quality of the various brands all owned by a single company would be very similar for a similar price point.
This is one of the key challenges that all manufacturers face - maintaining uniform quality ('quality control', 'quality assurance', Six Sigma, ISO xxxx, etc.) across a product line, between production runs, at different locations, etc., so that their customers can expect consistent product performance.
There will always be variation: that is fundamental to materials and processes. But a well run company will keep these variations within acceptable control limits, and most of us will never notice them.
I had an interesting conversation with an engineer of a (non-chainsaw) company that manufactures products in the US and China. He stated that there was a big difference between companies that own or control their own factories overseas, compared to companies that contract out products to overseas vendors. That difference was in the ability to maintain standards, tolerances, practices, etc. It it why people don't complain about the quality of iPhones made in China as much as some 'no-brand' tool or part clone sold on eBay.
Some companies contract out their products to different vendors, or change vendors periodically, so the quality and performance may vary between purchases. It's not technically difficult to stamp out the components of saw chain, but challenging to maintain consistency over millions (billion?) of tiny parts.
If someone purchases Rotary (or Archer, or Tri-link, etc.) chain and is happy with the performance, that is the bottom line. Personally, when I can buy Oregon or Carlton chain for the same price, my personal preference (bias?) is to choose those brands. I don't understand paying more for 'Power Care" (Tri-Link) chain at The Home Depot, when I can get Oregon or Carlton for less via other vendors, watching for sales, etc.
Philbert