Some company in Asia bought the rights to the Suntour and SR brand names several years ago and are making components under those names again. I don't know their cassette quality but current Suntour labeled suspension forks are pretty much department store quality.

Sunrace is also a second-tier Asian brand and I expect they are functional as I haven't heard a lot bad about them. Me, I'd stay with Shimano or SRAM cassettes.