Some of my friends have been saying that Cyanogen os is inferior to Oxygen os as three former is not 'upgradable' any more but the latter is.I don't know how much is true and what is true. Will anyone help me get things clarified?
Both Cyanogen OS and Oxygen OS are skins layered on top of Android. For years, manufacturers of smartphones have put their own software on their phones in order to set their phone apart. Every skin has its pros and cons: OxygenOS bundles various apps like Swiftkey and MaxxAudio, Cyanogen OS bundles different sofware, like AudioFX and Privacy Guard.
I recommend you compare the two roms carefully, but there is no objective winner in my eyes.