Well, college is the only thing that matters. Once you get into RV, you yourself will find that CS and IS are akin to each other. Both branches go parallely.
Let me make it very clear to you, CS is hyped because it is an older branch when compared to IS. Engineering college in India about 30-40 years ago used to have CS along with other electrical and mechanical branches. IS is a newer branch compared to CS. It has been existing only for a decade or two. This is the reason students prefer to go to CS because they have heard about it more from their parents or elders.
Coming back to RVCE, being a final year student of ISE, I am fairly eligible to list out the similarities and differences between the two branches. Considering the two most important factor the Curriculum and the Placements: