I am a former resident of Chhattisgarh and can comment on this question easily. Well, the biggest reason why students don’t prefer Raipur despite it having great facilities is that most people consider it unsafe for students. The whole of Chhattisgarh is believed to have been dominated by “Naxalites".
However, this is just a misconception as Naxalites are there only in Bastar, Dantewada district, and in the Manpur-Mohla-chowki-chhuriya regions of Rajnandgaon district. Additionally, Naxalites don’t attack common citizens and are only after politicians and policemen. Also, the government is taking measures to eradicate them completely.
Unlike the general opinion, Chhattisgarh is absolutely safe for students so you can consider it for your studies and rest assured.