I think sengoku and X are both top tier RPGs. Maybe not top tier VNs, because they have too much gameplay? But if so, why does anyone care about being top VN?
I based my reply on the vndb ranking, Sengoku is in the top 50 based on popularity, Rance X is near the top based on the score, but it has no English translation and only 825 votes.
Sure, play what you want, but I answered to Maxie's facetious reply that he had to "stoop down" from Rance to play other VNs. There are some real masterpiece VNs out there, so I hope he was only joking. Then again, Rance is pretty unique, so I can understand how it has such a cult following.