Which course would be better for a non-medical student among B.Sc honors and B.Sc non-med who wants to appear for IAS later?

It totally depends on your hard work and passion for IAS exam. If you choose a B.Com or BA degree then also you can do it. Civil services seem to be a dream of every aspiring student but out of lakhs of students some of them clear it. If you work hard you can definitely become an IAS.