I have read both as well. Maybe you didn't read World Online or Release that Witch. Similar to COPW in the sense of civilization development.
TWO is more ancient China era with VRMMO game system, and a lot of historical data that, if you are interested in those things, you will surely like it.
RTW has a system where the MC mixes knowledge of our time with the powers of witches (women with magical powers) in a medieval era world. And introduce firearms, electricity, airplanes. In my opinion it is better than COPW.
Kidnapped Dragon or The Novel Extra are also good, they have plot twists about the MC that make you see the story in a different way from those moments.
But a novel that makes me as nostalgic as this one despite being the first one I read is Second Coming of Gluttony. I remember it had a good story and the MC and supporting characters are all very good too. It's a harem, but only at the end or even the side stories. It has little importance in the main story.
